219 results on '"Zhenda Xie"'
Search Results
102. Self-Injection Locking of a Distributed Feedback Laser Diode Using a High-Finesse Fabry-Perot Microcavity
- Author
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Zhenda Xie, Shining Zhu, and Xing Wei
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Materials science ,Physics::Instrumentation and Detectors ,self-injection locking ,Physics::Optics ,01 natural sciences ,lcsh:Technology ,law.invention ,010309 optics ,lcsh:Chemistry ,Laser linewidth ,Finesse ,law ,0103 physical sciences ,General Materials Science ,Physics::Atomic Physics ,010306 general physics ,Instrumentation ,lcsh:QH301-705.5 ,Diode ,Fluid Flow and Transfer Processes ,Quantum optics ,business.industry ,lcsh:T ,Process Chemistry and Technology ,General Engineering ,Nonlinear optics ,distributed feedback ,fabry-perot microcavity ,Laser ,lcsh:QC1-999 ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Optoelectronics ,business ,lcsh:Engineering (General). Civil engineering (General) ,Lasing threshold ,Fabry–Pérot interferometer ,lcsh:Physics - Abstract
Optical microcavities have been widely used in nonlinear optics, quantum optics, and laser technologies. Here we demonstrate the self-injection locking of a distributed feedback diode laser using home-made high-finesse Fabry-Perot microcavity. The Fabry-Perot microcavity is fabricated from an x-cut lithium niobate crystal with highly reflective coatings. Frequency pulling effect can be observed for a successful locking, and results in a single-longitudinal mode lasing with narrow linewidth. The lasing wavelength and output power are found robust to the laser-diode current and temperature variations, in comparison to the free-running case. We further characterize the laser linewidth with beat note measurement with a high-performance external cavity diode laser, with beat-note linewidth of 601.85 kHz. This results shows a new method for laser frequency stabilization in a simple setup, and may find applications in telecommunication and spectroscopy.
- Published
- 2019
103. Effect of thickness variations of lithium niobate on insulator waveguide on the frequency spectrum of spontaneous parametric down-conversion*
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Yan-Xiao Gong, Guang-Tai Xue, Shining Zhu, Xiao-Hui Tian, Chi Zhang, Ping Xu, and Zhenda Xie
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Waveguide (electromagnetism) ,Photon ,Materials science ,business.industry ,Bandwidth (signal processing) ,Lithium niobate ,Physics::Optics ,General Physics and Astronomy ,Insulator (electricity) ,chemistry.chemical_compound ,Spontaneous parametric down-conversion ,chemistry ,Optoelectronics ,Nanometre ,business ,Parametric statistics - Abstract
We study the effect of waveguide thickness variations on the frequency spectrum of spontaneous parametric down-conversion in the periodically-poled lithium niobate on insulator (LNOI) waveguide. We analyze several variation models and our simulation results show that thickness variations in several nanometers can induce distinct effects on the central peak of the spectrum, such as narrowing, broadening, and splitting. We also prove that the effects of positive and negative variations can be canceled and thus lead to a variation-robust feature and an ultra-broad bandwidth. Our study may promote the development of on-chip photon sources in the LNOI platform, as well as opensup a way to engineer photon frequency state.
- Published
- 2021
104. WSe2/Pd Schottky diode combining van der Waals integrated and evaporated metal contacts
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Zhong Yan, Shining Zhu, Zhenda Xie, and Hao Wu
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Fabrication ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Contact resistance ,Schottky diode ,symbols.namesake ,Rectification ,symbols ,Optoelectronics ,Electronics ,van der Waals force ,business ,Ohmic contact ,Diode - Abstract
Metal–semiconductor junctions are at the heart of modern electronics. Various two-dimensional materials (2D) based electronic devices have been reported. However, Ohmic contacts between evaporated metal contacts and semiconducting 2D materials are still hard to achieve. Thus, design and fabrication of Schottky diodes based on layered WSe2 remain challenging. Here, we report a doping-free strategy to achieve Ohmic contacts in WSe2 diodes via van der Waals (vdW) contacts. We designed and fabricated vertical WSe2/Pd Schottky diodes, in which Ohmic and Schottky junctions can be realized simultaneously via vdW contacts and evaporated contacts, respectively. The specific contact resistance of the vdW contact is about 74.5 kΩ·μm2. The Schottky diodes exhibit strong rectification behavior with rectification ratio up to 105.
- Published
- 2021
105. Narrowband photonic quantum entanglement with counterpropagating domain engineering
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Zhenda Xie, Dong-Jie Guo, Jia-Chen Duan, Shining Zhu, Chang-Wei Sun, Yan-Xiao Gong, Yi-Chen Liu, and Ran Yang
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business.industry ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Quantum Physics ,Quantum entanglement ,Quantum channel ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Narrowband ,Bell's theorem ,Quantum mechanics ,High Energy Physics::Experiment ,Quantum information ,Photonics ,business ,Quantum information science ,Quantum - Abstract
Narrowband photonic entanglement is a crucial resource for long-distance quantum communication and quantum information processing, including quantum memories. We demonstrate the first polarization entanglement with 7.1 GHz inherent bandwidth by counterpropagating domain engineering, which is also confirmed by Hong–Ou–Mandel interference with 155-ps base-to-base dip width and ( 97.1 ± 0.59 ) % high visibility. The entanglement is harnessed with 18.5-standard-deviations Bell inequality violation, and further characterized with state tomography of ( 95.71 ± 0.61 ) % fidelity. Such narrowband entanglement sets a cornerstone for practical quantum information applications.
- Published
- 2021
106. Multifunctional Half-Floating-Gate Field-Effect Transistor Based on MoS2-BN-Graphene van der Waals Heterostructures.
- Author
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Hao Wu, Yinghao Cui, Jinlong Xu, Zhong Yan, Zhenda Xie, Yonghong Hu, and Shining Zhu
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- 2022
- Full Text
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107. The First Improper Ferroelectric of 2D Multilayered Hybrid Perovskite Enabling Strong Tunable Polarization‐Directed Second Harmonic Generation Effect
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Jiaqi Wang, Shiguo Han, Yu Ma, Zhenda Xie, Jinlong Xu, Lei Lu, Junhua Luo, Yi Liu, Wuqian Guo, and Zhihua Sun
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Biomaterials ,Materials science ,business.industry ,Electrochemistry ,Second-harmonic generation ,Optoelectronics ,Condensed Matter Physics ,business ,Polarization (waves) ,Ferroelectricity ,Electronic, Optical and Magnetic Materials ,Perovskite (structure) - Published
- 2021
108. Broadband Sheet Parametric Oscillator for χ (2) Optical Frequency Comb Generation via Cavity Phase Matching
- Author
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Baicheng Yao, Shining Zhu, Jian Guo, Hua-Ying Liu, Nicolò Sernicola, Shu-Wei Huang, Zhenlin Wang, Xin Ni, Xinjie Lv, Xiaohan Wang, Zhenda Xie, Kunpeng Jia, and Gang Zhao
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Optics ,Materials science ,business.industry ,Broadband ,General Physics and Astronomy ,Optical frequency comb ,Parametric oscillator ,business ,Phase matching - Abstract
We demonstrate a broadband optical parametric oscillation, using a sheet cavity, via cavity phase-matching. A 21.2 THz broad comb-like spectrum is achieved, with a uniform line spacing of 133.0 GHz, despite a relatively large dispersion of 275.4 fs2/mm around 1064 nm. With 22.6% high slope efficiency, and 14.9 kW peak power handling, this sheet optical parametric oscillator can be further developed for χ (2) comb.
- Published
- 2021
109. High-energy single-longitudinal-mode mid-infrared optical parametric amplifier seeded with sheet optical parametric oscillator
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Zhenda Xie, Xiaohan Wang, Kunpeng Jia, Jun Zhou, Hongquan Yao, Gang Zhao, Shining Zhu, and Xinjie Lv
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010302 applied physics ,Materials science ,business.industry ,Oscillation ,Physics ,QC1-999 ,Energy conversion efficiency ,Slope efficiency ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Optical parametric amplifier ,Longitudinal mode ,Laser linewidth ,0103 physical sciences ,Optical parametric oscillator ,Optoelectronics ,0210 nano-technology ,business ,Sensitivity (electronics) - Abstract
Mid-infrared (MIR) radiation is essential for remote gas sensing, ranging, and lidar applications, where high pulse energy and narrow linewidth are the keys to the high sensitivity over long distance. However, complex optical and electronic locking schemes are normally required to achieve both features at the same time. Here, we demonstrate pulse-pumped single-longitudinal-mode (SLM) MIR generation using a microresonator seed in the form of a sheet optical parametric oscillator (SOPO). The SOPO features a sub-coherence-length thickness of 400 µm, which enables SLM and high-energy oscillation using cavity phase matching. Its output around 1.55 µm is seeded into an optical parametric amplifier and locks the MIR output in SLM at 3.38 µm. In a simple and compact setup, up to 21% conversion efficiency and 22% slope efficiency are measured with a MIR output energy of 54 µJ. This SLM MIR source with the SOPO seed greatly reduces the system size and is compatible for further integration for field-deployable devices and thus has broad applications in the field of remote gas sensing.
- Published
- 2021
110. A highly selective two-photon fluorogenic probe for formaldehyde and its bioimaging application in cells and zebrafish
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Hongyan Sun, Zhenda Xie, Jingyan Ge, Huatang Zhang, Qing Zhu, Siyang He, Tianwen Bai, and Jun Ling
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biology ,010405 organic chemistry ,Metals and Alloys ,Formaldehyde ,Nanotechnology ,010402 general chemistry ,Condensed Matter Physics ,biology.organism_classification ,Highly selective ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,chemistry ,Two-photon excitation microscopy ,In vivo ,Intramolecular force ,Materials Chemistry ,Biophysics ,Electrical and Electronic Engineering ,Cytotoxicity ,Instrumentation ,Zebrafish - Abstract
We report a novel turn-on two-photon fluorescent probe (TPNF) for detecting formaldehyde based on aza-Cope rearrangement and intramolecular charge transfer (ICT). The probe, containing a 1,8-naphthalimide dye with a homoallylamino group, has was shown with high selectivity, sensitivity and low cytotoxicity and it was capable of detecting formaldehyde in live cells. Moreover, a time-dependent density functional theory (TD-DFT) calculation was performed to demonstrate the turn on mechanism of the probe via ICT effect. Finally, a zebrafish larvae imaging experiment reveals that TPNF displayed a significant signal change when treated with FA in vivo. These results indicated that TPNF is a promising tool in more biomedical researches.
- Published
- 2017
111. Efficient C-band single-photon upconversion with chip-scale Ti-indiffused pp-LiNbO
- Author
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Zhenda, Xie, Kai Hong, Luo, Kai Chi, Chang, Nicolae C, Panoiu, Harald, Herrmann, Christine, Silberhorn, and Chee Wei, Wong
- Abstract
Frequency upconversion for single photons at telecom wavelengths is important to simultaneously meet the different wavelength requirements for long-distance communications and quantum memories in a quantum nodal network. It also enables the detection for the telecom "flying qubit" photons with silicon-based efficient single-photon detectors with low dark count (DC) rates. Here, we demonstrate the frequency upconversion of attenuated single photons, using a low-loss titanium-indiffused periodically poled lithium niobate waveguide, pumped with a readily available erbium-doped fiber amplifier in the L-band. Internal and conversion efficiencies up to 84.4% and 49.9% have been achieved, respectively. The DC rates are suppressed down to 44 kHz at 13.9% end-to-end quantum efficiency (including full conversion and detection), enabled by our long-wavelength pump configuration and narrow 3.5-GHz bandpass filtering.
- Published
- 2019
112. Graphene enhanced intra-resonator biochemical detection with individual molecule sensitivity and selectivity
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Lei Bi, Baicheng Yao, Chenye Qin, Cao Zhongxu, Zhenda Xie, and Yuanfu Chen
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Heterodyne ,Materials science ,Graphene ,business.industry ,Oxide ,02 engineering and technology ,Biochemical detection ,01 natural sciences ,law.invention ,010309 optics ,chemistry.chemical_compound ,Resonator ,020210 optoelectronics & photonics ,chemistry ,Interference (communication) ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Molecule ,Optoelectronics ,Selectivity ,business - Abstract
Partially-reduced graphene oxide (prGO) inner-coated and fiber-calibrated Fabry-Perot dye resonator for biochemical detection enables the functionalized FRET-gain-assistance and intermode heterodyne interference, we achieve individual molecule sensitivity for dopamine, nicotine and ssDNA.
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- 2019
113. On-chip engineering of high-dimensional path-entangled states in a quadratic coupled-waveguide system
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Zhenda Xie, Hua-Ying Liu, Rong Zhang, Ping Xu, Chang-Wei Sun, Yan-Xiao Gong, Shining Zhu, Xiang-Wen Luo, and Qun-Yong Zhang
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Coupling ,Quantum technology ,Physics ,Quadratic equation ,Photon ,Path (graph theory) ,TheoryofComputation_GENERAL ,Quantum entanglement ,Topology ,Quantum ,Parametric statistics - Abstract
High-dimensional quantum entangled states are a highly desired resource for their extended possibilities in quantum information processing. In this paper, we introduce on-chip engineering of a variety of path-entangled states based on the simultaneous enabling of spontaneous parametric down-conversion and efficient coupling between waveguides in a quadratic coupled-waveguide system. By varying the properties of pump beams, the phase-matching conditions, and the coupling coefficients in a three-coupled-waveguide system, it is possible to generate the deterministic and robust three-path biphoton entangled states without any postprocessing, as well as to transform the output photons among different types of path entanglement. This integrated implementation of the entanglement source will become an important building block for practical applications of on-chip quantum technologies.
- Published
- 2019
114. Narrow-band source of polarization-entangled photons with counterpropagating domain engineering
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Yan-Xiao Gong, Yi-Chen Liu, Zhenda Xie, and Dong-Jie Guo
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Physics ,business.industry ,Physics::Optics ,Quantum Physics ,Quantum entanglement ,Quantum tomography ,Photon entanglement ,Bell's theorem ,Quantum mechanics ,Photonics ,Quantum information ,business ,Quantum information science ,Quantum computer - Abstract
Photonic entanglement is central resource to quantum information sciences, such as quantum communication and quantum computation. The entangled photons generated in conventional spontaneous parametric down-conversion usually yield THz bandwidth which becomes very dim in many applications call for narrow-band entanglement sources. Here we demonstrate the polarization-entanglement photon source with counterpropagating phase matching, which results in an inherent bandwidth of 7.1 GHz at telecom wavelength. The entanglement is measured to violate the Bell inequality by up to 18.5 standard deviations, with Clauser–Horne–Shimony–Holt S-parameter of 2.720±0.039. The quantum state tomography further characterizes the entanglement, with fidelity F=(95.71±0.61)%.
- Published
- 2019
115. Local Relation Networks for Image Recognition
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Zhenda Xie, Han Hu, Stephen Lin, and Zheng Zhang
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FOS: Computer and information sciences ,Computer Science - Machine Learning ,Relation (database) ,Computer science ,Computer Science - Artificial Intelligence ,Computer Vision and Pattern Recognition (cs.CV) ,Feature extraction ,Computer Science - Computer Vision and Pattern Recognition ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Convolution ,Machine Learning (cs.LG) ,0202 electrical engineering, electronic engineering, information engineering ,Feature (machine learning) ,Computer vision ,Pattern matching ,Layer (object-oriented design) ,0105 earth and related environmental sciences ,Pixel ,Contextual image classification ,business.industry ,Artificial Intelligence (cs.AI) ,020201 artificial intelligence & image processing ,Artificial intelligence ,business - Abstract
The convolution layer has been the dominant feature extractor in computer vision for years. However, the spatial aggregation in convolution is basically a pattern matching process that applies fixed filters which are inefficient at modeling visual elements with varying spatial distributions. This paper presents a new image feature extractor, called the local relation layer, that adaptively determines aggregation weights based on the compositional relationship of local pixel pairs. With this relational approach, it can composite visual elements into higher-level entities in a more efficient manner that benefits semantic inference. A network built with local relation layers, called the Local Relation Network (LR-Net), is found to provide greater modeling capacity than its counterpart built with regular convolution on large-scale recognition tasks such as ImageNet classification.
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- 2019
- Full Text
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116. Broadband χ(2) and χ(3) nonlinear frequency up-conversion from planar silicon nitride microcavities
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Mingbin Yu, Dim-Lee Kwong, Zhenda Xie, Chee Wei Wong, Jinghui Yang, and Shu-Wei Huang
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Sum-frequency generation ,Materials science ,business.industry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,Nonlinear system ,chemistry.chemical_compound ,Planar ,Frequency conversion ,Silicon nitride ,chemistry ,0103 physical sciences ,Broadband ,Optoelectronics ,Up conversion ,Symmetry breaking ,0210 nano-technology ,business - Abstract
We report χ(2) and χ(3) frequency up-conversion in silicon nitride microcavities. Pumped by C-/L- band, a broadband frequency conversion from 437 nm to 816 nm is obtained based on regenerative satellite comb structures, with χ(2) process supported by nitride-oxide surface symmetry breaking.
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- 2019
117. Multi-phase-matched satellite frequency combs
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Jinghui Yang, Shu-Wei Huang, Zhenda Xie, Mingbin Yu, Dim-Lee Kwong, and Chee Wei Wong
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- 2019
118. Monolithic Mid-Infrared Optical Frequency Comb Generator via Parametric Down Conversion
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Shining Zhu, Zhenda Xie, Xiaohan Wang, Xin Ni, Jian Guo, Shu-Wei Huang, and Kunpeng Jia
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Materials science ,business.industry ,Superlattice ,Physics::Optics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Power (physics) ,010309 optics ,Generator (circuit theory) ,Resonator ,Frequency comb ,Spontaneous parametric down-conversion ,Q factor ,0103 physical sciences ,Optoelectronics ,Optical frequency comb ,0210 nano-technology ,business - Abstract
We demonstrate the first mid-infrared frequency comb generation via optical parametric down conversion from a high-Q χ(2) optical superlattice box resonator. Low noise comb is achieved with high output power.
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- 2019
119. Optoelectronic biosensing in graphene driven fiber resonators with single-molecule sensitivity and selectivity
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Baicheng Yao, Zhongxu Cao, Yu Wu, Teng Tan, Chenye Qin, Yuanfu Chen, Yuan Gong, Zhenda Xie, Chee Wei Wong, and Yunjiang Rao
- Published
- 2019
120. High-Dimensional Energy-Time Entanglement up to 6 Qubits per Photon through Biphoton Frequency Comb
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Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan, Drew-Derrick Mendinueto, Yoo Seung Lee, Tian Zhong, Yan-Xiao Gong, Zhenda Xie, Jeffrey H. Shapiro, Franco N. C. Wong, and Chee Wei Wong
- Published
- 2019
121. Narrow-linewidth self-injection locked diode laser with a high-Q fiber Fabry–Perot resonator
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Jian Guo, Shining Zhu, Kunpeng Jia, Gang Zhao, Xin Ni, Liyun Hao, Zhenda Xie, Dong-Jie Guo, Xiaohan Wang, and Pengfei Fan
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Materials science ,business.industry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Resonator ,Laser linewidth ,Optics ,Quality (physics) ,law ,Fiber laser ,0103 physical sciences ,Fiber ,0210 nano-technology ,business ,Fabry–Pérot interferometer ,Diode - Abstract
Narrow-linewidth lasers are essential for various applications, but are limited by their size, weight, power, and cost requirements. Here we demonstrate a self-injection locked diode laser fabricated with a high quality factor fiber Fabry–Perot resonator, with a 145 Hz free-running linewidth. The locking scheme is all-fiber for plug-and-play operation. White frequency noise of 50 H z 2 / H z is measured with over 42 dB reduction from the low-cost TO-can distributed feedback laser diode, and shows its wide applications in a compact and cost-effective way.
- Published
- 2021
122. Effect of dimension variation for second-harmonic generation in lithium niobate on insulator waveguide [Invited]
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Yan-Xiao Gong, Wei Zhou, Guang-Tai Xue, Xiaopeng Hu, Zhenda Xie, Xinlun Cai, Xiaoyue Liu, Shining Zhu, Kun-Qian Ren, Jia-Chen Duan, Xiao-Hui Tian, and Chi Zhang
- Subjects
Materials science ,Fabrication ,business.industry ,Lithium niobate ,Physics::Optics ,Second-harmonic generation ,Insulator (electricity) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Wavelength ,chemistry.chemical_compound ,Optics ,chemistry ,Dimension (vector space) ,law ,Nanometre ,Electrical and Electronic Engineering ,business ,Waveguide - Abstract
We study the effect of dimension variation for second-harmonic generation (SHG) in lithium niobate on insulator (LNOI) waveguides. Non-trivial SHG profiles in both type-0 and type-I quasi-phase matching are observed during the wavelength tuning of the fundamental light. Theoretical modeling shows that the SHG profile and efficiency can be greatly affected by the waveguide cross-section dimension variations, especially the thickness variations. In particular, our analysis shows that a thickness variation of tens of nanometers is in good agreement with the experimental results. Such investigations could be used to evaluate fabrication performance of LNOI-based nonlinear optical devices.
- Published
- 2021
123. Widely tunable optical parametric oscillator in periodically poled congruently grown lithium tantalite whispering gallery mode resonators
- Author
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Mo Qijin, Jiang Xudong, Yi-Chen Liu, Shifeng Li, Xinjie Lv, Shining Zhu, Gang Zhao, and Zhenda Xie
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Materials science ,Tantalite ,Physics::Optics ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,010309 optics ,Laser linewidth ,Resonator ,Optics ,Spontaneous parametric down-conversion ,0103 physical sciences ,Electrical and Electronic Engineering ,Astrophysics::Galaxy Astrophysics ,Total internal reflection ,business.industry ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,chemistry ,Optical parametric oscillator ,engineering ,Lithium ,Whispering-gallery wave ,0210 nano-technology ,business - Abstract
We demonstrate a tunable optical parametric oscillator in a periodically poled congruently grown lithium tantalite whispering gallery mode resonator. The resonator is mechanically polished to millimeter size, and the quality factor is approximately 107 at 1064 nm. Our experiments show that this kind of resonator is capable of reaching a very low threshold and having a wide tuning range. Combined with its narrow resonant linewidth, it is potentially used as a compact, widely tunable, and narrow-linewidth infrared to mid-infrared laser source.
- Published
- 2016
124. Enhanced saturable absorption of MoS2 black phosphorus composite in 2 μm passively Q-switched Tm: YAP laser
- Author
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Yang Xue, Yang Xue, primary, Zhenda Xie, Zhenda Xie, additional, Zhilin Ye, Zhilin Ye, additional, Xiaopeng Hu, Xiaopeng Hu, additional, Jinlong Xu, Jinlong Xu, additional, and Han Zhang, Han Zhang, additional
- Published
- 2018
- Full Text
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125. Giant and Broadband Multiphoton Absorption Nonlinearities of a 2D Organometallic Perovskite Ferroelectric
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Jinlong Xu, Yanming Xu, Maofan Li, Zhiyun Xu, Zhenda Xie, Zhihua Sun, Junhua Luo, Maochun Hong, Yi Liu, and Shiguo Han
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Materials science ,business.industry ,Mechanical Engineering ,Oxide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Polarization (waves) ,01 natural sciences ,Ferroelectricity ,0104 chemical sciences ,Organic molecules ,Biophotonics ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Electric field ,Broadband ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business - Abstract
Multiphoton absorption (MPA) has been utilized for important technological applications. High-order multiphoton harvesting (e.g., five-photon absorption, 5PA) exhibits unique properties that could benefit biophotonics. Within this field, perovskite oxide ferroelectrics (e.g., BaTiO3 ) enable low-order optical nonlinearities of 2PA/3PA processes. However, it is challenging to obtain efficient, high-order 5PA effects. Herein, for the first time, giant and broadband MPA properties are presented in the 2D hybrid perovskite ferroelectric (IA)2 (MA)2 Pb3 Br10 (1; IA = isoamylammonium and MA = methylammonium), where multiphoton-excited optical nonlinearities related to different MPA mechanisms over a broadband range of 550-2400 nm are observed. Strikingly, its 5PA absorption cross-section (σ5 ) reaches up to 1.2 × 10-132 cm10 s4 photon-4 (at 2400 nm), almost 10 orders larger than some state-of-the-art organic molecules and a record-high value among all known ferroelectrics. This unprecedented 5PA effect results from the quantum-confined motif of inorganic trilayer sheets (wells) and organic cations (barriers) in 1. Moreover, its large ferroelectric polarization of 5 µC cm-2 could promote modulation of MPA effects under external electric fields. As far as it is known, this is the first report on giant, broadband high-order MPA properties in ferroelectrics, which provides potential, novel electric-ordered materials for next-generation biophotonic applications.
- Published
- 2020
126. Plasmon‐Assisted Broadband All‐Optical Control of Highly Intense Femtosecond Laser by Weak Continuous‐Wave Laser
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Zhenda Xie, Hao Wu, Zhong Yan, Chi Zhang, Shining Zhu, Jinlong Xu, Yanming Xu, and Yonghong Hu
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Materials science ,business.industry ,All optical modulation ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,All optical ,law ,Quantum dot ,Femtosecond ,Broadband ,Optoelectronics ,Continuous wave ,business ,Plasmon - Published
- 2020
127. Generation of narrowband counterpropagating polarization-entangled photon pairs based on thin-film lithium niobate on insulator
- Author
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Yan-Xiao Gong, Ji-Ning Zhang, Yi-Chen Liu, Ping Xu, Yin-Jun Zhu, Zhenda Xie, Jia-Chen Duan, Chang-Wei Sun, and Shining Zhu
- Subjects
Physics ,Photon ,business.industry ,Lithium niobate ,Physics::Optics ,Statistical and Nonlinear Physics ,Insulator (electricity) ,Polarization (waves) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,chemistry.chemical_compound ,Narrowband ,chemistry ,0103 physical sciences ,Optoelectronics ,Wave vector ,Physics::Atomic Physics ,Thin film ,Photonics ,business ,Nonlinear Sciences::Pattern Formation and Solitons - Abstract
We propose a scheme for the generation of counterpropagating polarization-entangled photon pairs from a periodically poled lithium niobate on insulator waveguide. The waveguide is designed to enable a special dispersion relationship between the T M 00 and T E 00 modes that allows two concurrent counterpropagating quasi-phase-matching type-II spontaneous parametric downconversion processes with a single reciprocal wave vector. Due to the counterpropagating phase-matching geometry, the source has a narrow bandwidth in the order of several gigahertz. The compact source opens up a new method for integrated photonic technologies.
- Published
- 2020
128. Optimizing the efficiency of a periodically poled LNOI waveguide using in situ monitoring of the ferroelectric domains
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Yan Chen, Shining Zhu, Zhenda Xie, Yong Zhang, Yunfei Niu, Chen Lin, Yan-Xiao Gong, Xiaoyue Liu, Xinlun Cai, and Xiaopeng Hu
- Subjects
010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Lithium niobate ,Nanophotonics ,Physics::Optics ,Insulator (electricity) ,02 engineering and technology ,Converters ,Optical field ,021001 nanoscience & nanotechnology ,01 natural sciences ,Ferroelectricity ,chemistry.chemical_compound ,chemistry ,Duty cycle ,0103 physical sciences ,Optoelectronics ,Photonics ,0210 nano-technology ,business - Abstract
Lithium niobate on insulator (LNOI) is a unique platform for integrated photonic applications and especially for high-efficiency nonlinear frequency converters because of the strong optical field confinement. In this work, we fabricated a 6-mm-long periodically poled LNOI ridge waveguide with an optimized duty cycle (50:50) using an active domain structure monitoring method. The performance of the single-pass second-harmonic generation and difference-frequency generation in the nanophotonic waveguide was characterized, and the normalized conversion efficiencies were ∼80% of the theoretical values. These high-quality frequency conversion devices can pave the way for the application of LNOI in nonlinear integrated photonics.
- Published
- 2020
129. Ultra-broadband enhanced nonlinear saturable absorption for Mo0.53W0.47Te2 nanosheets
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Hui Wu, Du Zhengting, Xinjie Lü, Tianqi Zhang, Gang Zhao, Zhenda Xie, Yangyang Lü, Shining Zhu, and Jinlong Xu
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Materials science ,business.industry ,Alloy ,Nonlinear optics ,Saturable absorption ,engineering.material ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Amplitude modulation ,Nonlinear system ,Optics ,Transmission electron microscopy ,Modulation ,engineering ,Figure of merit ,Electrical and Electronic Engineering ,business - Abstract
Alloying in two-dimension has been a hot spot in the development of new, versatile systems of optics and electronics. Alloys have been demonstrated to be a fascinating strategy to modulate the chemical and electronic properties of two-dimensional nanosheets. We firstly reported ultra-broadband enhanced nonlinear saturable absorption of Mo0.53W0.47Te2 alloy at 0.6, 1.0, and 2.0 μm. The nonlinear saturable absorption of Mo0.53W0.47Te2 saturable absorber (SA) was measured by the open aperture Z-scan technique. Compared to MoTe2 and WTe2 SAs, the Mo0.53W0.47Te2 SA showed five times deeper modulation depth, 8.6% lower saturable intensity, and one order larger figure of merit. Thus, our research provides a method of alloys to find novel materials with more outstanding properties for optics and optoelectronic applications.
- Published
- 2020
130. Robust second-order correlation of twin parametric beams generated by amplified spontaneous parametric down-conversion
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Kunpeng Jia, Xiaohan Wang, Zhenlin Wang, Zhenda Xie, Yan-Xiao Gong, Chee Wei Wong, Gang Zhao, Xinjie Lü, Shining Zhu, and Ping Xu
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Photocurrent ,Quantum optics ,Physics ,Photon ,business.industry ,Optical communication ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Power (physics) ,Crystal ,Optics ,Spontaneous parametric down-conversion ,Electrical and Electronic Engineering ,business ,Parametric statistics - Abstract
We report an observation of the second-order correlation between twin beams generated by amplified spontaneous parametric down-conversion operating above threshold with kilowatt-level peak power, from a periodically poled LiTaO3 crystal via a single-pass scheme. Photocurrent correlation was measured because of the bright photon streams, with raw visibility of 37.9% or 97.3% after electronic filtering. As expected in our theory, this correlation is robust and insensitive to parametric gain and detection loss, enabling important applications in optical communications, precision measurement, and nonlocal imaging.
- Published
- 2020
131. Liquid metal as a broadband saturable absorber for passively Q-switched lasers
- Author
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Tianqi Zhang, Yang Xue, Shining Zhu, Jinlong Xu, Zhenda Xie, and Mudong Wang
- Subjects
Liquid metal ,Nonlinear absorption ,Materials science ,business.industry ,Single pulse ,Saturable absorption ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Power (physics) ,Optics ,law ,Broadband ,Electrical and Electronic Engineering ,business ,Pulse-width modulation - Abstract
We demonstrated the efficient plasmon-induced nonlinear absorption of liquid metal GaInSn nanospheres prepared by a facile liquid-phase method. With GaInSn as saturable absorbers, a passively Q-switching operation was obtained at both 1.3 and 2 μm. The pulse width of 32 ns was achieved at 1.3 μm with repetition rate of 44 kHz, single pulse energy of 51.9 μJ, and output power of 425 mW. Meanwhile, 510 ns and 92 kHz pulses with energy of 36.1 μJ and output power of 2.48 W were obtained at 2 μm. This work provides the potential of liquid metal for improving metal functions and flexible optical devices.
- Published
- 2020
132. A dual functional fluorogenic probe for visualization of intracellular pH and formaldehyde with distinct fluorescence signals
- Author
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Jingyan Ge, Danqi Hong, Liquan Zhu, Qing Zhu, Zhenda Xie, Biao Yin, and Jiajie Shen
- Subjects
biology ,Chemistry ,Intracellular pH ,Organic Chemistry ,Formaldehyde ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,biology.organism_classification ,01 natural sciences ,Biochemistry ,Fluorescence ,0104 chemical sciences ,HeLa ,chemistry.chemical_compound ,Biophysics ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
In this study, a single fluorescent probe (DPFP) containing a 1,8-naphthalimide dye and a homoallylamino group for imaging pH and formaldehyde (FA) has been developed that exhibits significant blue fluorescence (λem at 455 nm) under acidic pH conditions (pH < 7.0) and green fluorescence (λem at 555 nm) in the presence of FA, respectively. Furthermore, probe DPFP was successfully applied to image acidic lysosomes and exogenous or endogenous FA in living HeLa cells.
- Published
- 2018
133. High-dimensional entanglement in quantum frequency combs (Conference Presentation)
- Author
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Chee Wei Wong, Xiang Cheng, Zhenda Xie, Alvin Li, Xuan Cui, Kai-Chi Chang, and Yoo Seung Lee
- Subjects
Physics ,Bell state ,Interferometry ,Photon ,Qubit ,Quantum mechanics ,Linear optical quantum computing ,Quantum Physics ,Quantum entanglement ,Quantum channel ,Quantum - Abstract
Quantum entanglement is a fundamental resource for secure information processing and communications. The canonical optical quantum information processing encodes a single qubit per photon, with remarkable demonstrations of secure quantum communications, linear optical quantum computing amongst others. Often the polarization qubit, a discrete variable with entangled Bell states, is used. Continuous variables such as energy-time modes and spatial modes, however, present a dramatically larger Hilbert space for quantum information processing. The high-dimensional entanglement capture more qubits per photon, enabling dramatically higher secure key rates over longer distances and with better error resilience. Here I will describe our results on high-dimensional entanglement in quantum frequency combs for dense quantum communications. We first demonstrate revival of the Hong-Ou-Mandel interferences, long postulated by theorists more than a decade ago, up to 19-dimensions and with visibilities up to 96.5%. The mode-locked two-photon state in high-dimensions is further witnessed through a stabilized Franson interferometer, as a generalized Bell’s inequality test and hyperentangled through multiple degrees-of-freedom. Entanglement revivals of the non-local interference at discrete time-bins are uncovered, up to 97.8% visibility, as a fundamental resource for dense secure information processing.
- Published
- 2018
134. Type-1 and type-2 satellites in Kerr frequency combs
- Author
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Chee Wei Wong, Zhenda Xie, Jinghui Yang, Mingbin Yu, D. L. Kwong, and Shu-Wei Huang
- Subjects
Optical amplifier ,Physics ,business.industry ,Energy conversion efficiency ,Nonlinear optics ,02 engineering and technology ,Type (model theory) ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,chemistry.chemical_compound ,Optics ,Mode-locking ,Silicon nitride ,chemistry ,0103 physical sciences ,Satellite ,0210 nano-technology ,business ,Phase matching - Abstract
We report Kerr frequency combs with two types of satellites, enabled by multiple phase matching in microcavities. Satellite comb clusters at ≈ 1.3 μm and 2.0 μm regimes are simultaneously generated with the central comb, with a demonstrated high external conversion efficiency reaching up to -30dB.
- Published
- 2018
135. A High-Power Continuous-Wave Mid-Infrared Optical Parametric Oscillator Module
- Author
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Xie Xukai, Zhenda Xie, Shining Zhu, Jian Ning, Yi-Chen Liu, Gang Zhao, and Xinjie Lv
- Subjects
Ytterbium ,Materials science ,chemistry.chemical_element ,02 engineering and technology ,Laser pumping ,lcsh:Technology ,01 natural sciences ,Square (algebra) ,lcsh:Chemistry ,010309 optics ,mid-infrared laser ,optical parametric oscillator ,laser module ,Fiber laser ,0103 physical sciences ,General Materials Science ,lcsh:QH301-705.5 ,Instrumentation ,Fluid Flow and Transfer Processes ,lcsh:T ,business.industry ,Process Chemistry and Technology ,Energy conversion efficiency ,General Engineering ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,Computer Science Applications ,Power (physics) ,lcsh:Biology (General) ,lcsh:QD1-999 ,chemistry ,lcsh:TA1-2040 ,Optical parametric oscillator ,Continuous wave ,Optoelectronics ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,business ,lcsh:Physics - Abstract
We demonstrate here a compact optical parametric oscillator module for mid-infrared generation via nonlinear frequency conversion. This module weighs only 2.5 kg and fits within a small volume of 220 × 60 × 55 mm3. The module can be easily aligned to various pump laser sources, and here we use a 50 W ytterbium (Yb)-doped fiber laser as an example. With a two-channel MgO-doped periodically poled lithium niobate crystal (MgO:PPLN), our module covers a tuning range of 2416.17–2932.25 nm and 3142.18–3452.15 nm. The highest output power exceeds 10.4 W at 2.7 μm, corresponding to a conversion efficiency of 24%. The measured power stability is 2.13% Root Meat Square (RMS) for a 10 h duration under outdoor conditions.
- Published
- 2017
- Full Text
- View/download PDF
136. Broadband gate-tunable THz plasmons in graphene heterostructures
- Author
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Yu Wu, Yuan Liu, Chee Wei Wong, Chanyeol Choi, Dim-Lee Kwong, Jaime Gonzalo Flor Flores, Yu Huang, Xiangfeng Duan, Baicheng Yao, Shu-Wei Huang, Mingbin Yu, Yun-Jiang Rao, and Zhenda Xie
- Subjects
Materials science ,Terahertz radiation ,Phonon ,FOS: Physical sciences ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,law.invention ,symbols.namesake ,law ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Landau damping ,010306 general physics ,Plasmon ,Graphene ,business.industry ,Saturable absorption ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Dirac fermion ,Quasiparticle ,symbols ,Optoelectronics ,0210 nano-technology ,business ,Optics (physics.optics) ,Physics - Optics - Abstract
Graphene, a unique two-dimensional material comprising carbon in a honeycomb lattice 1 , has brought breakthroughs across electronics, mechanics and thermal transport, driven by the quasiparticle Dirac fermions obeying a linear dispersion 2,3 . Here, we demonstrate a counter-pumped all-optical difference frequency process to coherently generate and control terahertz plasmons in atomic-layer graphene with octave-level tunability and high efficiency. We leverage the inherent surface asymmetry of graphene for strong second-order nonlinear polarizability 4,5 , which, together with tight plasmon field confinement, enables a robust difference frequency signal at terahertz frequencies. The counter-pumped resonant process on graphene uniquely achieves both energy and momentum conservation. Consequently, we demonstrate a dual-layer graphene heterostructure with terahertz charge- and gate-tunability over an octave, from 4.7 THz to 9.4 THz, bounded only by the pump amplifier optical bandwidth. Theoretical modelling supports our single-volt-level gate tuning and optical-bandwidth-bounded 4.7 THz phase-matching measurements through the random phase approximation, with phonon coupling, saturable absorption and below the Landau damping, to predict and understand graphene plasmon physics. An all-optical difference frequency process is exploited to generate terahertz graphene plasmons that are tunable over an octave.
- Published
- 2017
137. Harnessing high-dimensional hyperentanglement through a biphoton frequency comb
- Author
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Junlin Liang, Chee Wei Wong, Zhenda Xie, Joshua C. Bienfang, Alessandro Restelli, Jeffrey H. Shapiro, Tian Zhong, XinAn Xu, Yan-Xiao Gong, Franco N. C. Wong, Sajan Shrestha, Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Research Laboratory of Electronics, Zhong, Tian, Shapiro, Jeffrey H., and Wong, Franco N. C.
- Subjects
Physics ,Quantum optics ,Quantum Physics ,Quantum revival ,FOS: Physical sciences ,High dimensional ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Frequency comb ,Quantum mechanics ,Qubit ,Quantum Physics (quant-ph) ,Optics (physics.optics) ,Physics - Optics - Abstract
Quantum entanglement is a fundamental resource for secure information processing and communications, and hyperentanglement or high-dimensional entanglement has been separately proposed for its high data capacity and error resilience. The continuous-variable nature of the energy–time entanglement makes it an ideal candidate for efficient high-dimensional coding with minimal limitations. Here, we demonstrate the first simultaneous high-dimensional hyperentanglement using a biphoton frequency comb to harness the full potential in both the energy and time domain. Long-postulated Hong–Ou–Mandel quantum revival is exhibited, with up to 19 time-bins and 96.5% visibilities. We further witness the high-dimensional energy–time entanglement through Franson revivals, observed periodically at integer time-bins, with 97.8% visibility. This qudit state is observed to simultaneously violate the generalized Bell inequality by up to 10.95 standard deviations while observing recurrent Clauser–Horne–Shimony–Holt S-parameters up to 2.76. Our biphoton frequency comb provides a platform for photon-efficient quantum communications towards the ultimate channel capacity through energy–time–polarization high-dimensional encoding., United States. Defense Advanced Research Projects Agency. Information in a Photon (InPho) Program (Contract W911NF-10-1-0416)
- Published
- 2015
138. 2.8 μm Passively Q-switched solid state pulse laser based on MoS2/Graphene heterojunction
- Author
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Gang Zhao, Jinlong Xu, Xinjie Lv, and Zhenda Xie
- Subjects
Materials science ,Graphene ,business.industry ,Solid-state ,Heterojunction ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Q-switching ,Hydrothermal circulation ,0104 chemical sciences ,Pulsed laser deposition ,law.invention ,Optical modulator ,Solid-state laser ,law ,Optoelectronics ,0210 nano-technology ,business - Abstract
The MoS 2 /Graphene heterojunction prepared through a facile hydrothermal method is used as an optical modulator to realize 2.8 μm passively Q-switched solid state pulse laser for the first time as far as we know. This work certifies that the two-dimensional material heterojunction is a kind of outstanding mid-infrared modulators.
- Published
- 2017
139. Widely-tunable Mid-infrared Optical Parametric Oscillation in High-Q Periodically Poled Lithium Tantalate Whispering Gallery Mode Resonators
- Author
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Zhenda Xie, Kunpeng Jia, Shining Zhu, Yi-Chen Liu, Xinjie Lv, Gang Zhao, and Mo Qijin
- Subjects
Materials science ,business.industry ,Oscillation ,Parametric oscillation ,Slope efficiency ,Mid infrared ,Physics::Optics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,02 engineering and technology ,chemistry.chemical_compound ,Resonator ,020210 optoelectronics & photonics ,chemistry ,Lithium tantalate ,0202 electrical engineering, electronic engineering, information engineering ,Optical parametric oscillator ,Optoelectronics ,Whispering-gallery wave ,business - Abstract
We demonstrate a widely-tunable mid-infrared optical parametric oscillator in a monolithic periodically poled lithium Tantalate whispering-gallery-mode resonator. Low-threshold oscillation is achieved with 57.6% slope efficiency, covering the spectral range from 1.7 to 2.85μm.
- Published
- 2017
140. A chip-scale single-photon SWAP gate as integrated interface between polarization and spatial-momentum qubits
- Author
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Zhenda Xie, Chee Wei Wong, Mingbin Yu, Tian Zhong, Dim-Lee Kwong, XinAn Xu, Yongnan Li, Andrzej Veitia, Abhinav Kumar, Serdar Kocaman, and Franco N. C. Wong
- Subjects
Physics ,Photon ,business.industry ,Physics::Optics ,Silicon on insulator ,Error ratio ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Chip ,Polarization (waves) ,01 natural sciences ,Computer Science::Other ,010309 optics ,Computer Science::Hardware Architecture ,Phase coherence ,Optics ,Qubit ,0103 physical sciences ,0210 nano-technology ,business ,Swap (computer programming) - Abstract
We demonstrate a single-photon SWAP gate between polarization and spatial momentum on a SOI chip. 19.8% error ratio is obtained, and phase coherence of the SWAP operation is measured via single photon interference with up to 58.7% visibility.
- Published
- 2017
141. Compact generation of a two-photon multipath Dicke state from a single χ(2) nonlinear photonic crystal
- Author
-
Yan-Xiao Gong, Zhenda Xie, Hua-Ying Liu, Ping Xu, Rong Zhang, and Shining Zhu
- Subjects
Physics ,business.industry ,Physics::Optics ,Quantum Physics ,02 engineering and technology ,Quantum entanglement ,Quantum channel ,021001 nanoscience & nanotechnology ,01 natural sciences ,Multipartite entanglement ,Atomic and Molecular Physics, and Optics ,010309 optics ,Multipartite ,Optics ,Quantum mechanics ,0103 physical sciences ,Nonlinear photonic crystal ,0210 nano-technology ,business ,Quantum information science ,Quantum ,Quantum computer - Abstract
Multipartite quantum entanglement is a powerful resource for enriching the functionality of quantum computation and quantum communication. In this Letter, we propose a new method to generate a two-photon multipath Dicke state with concurrent spontaneous parametric downconversion processes from a single periodically poled nonlinear photonic crystal. We design the poling structure to produce a three-path Dicke state where three quasi-phase-matching conditions are fulfilled simultaneously by a hybrid one- and two-dimensionally poled nonlinear photonic crystal. We use genuine multipartite entanglement concurrence to quantify the entanglement of the Dicke state. Using a more complicated poling configuration like multiple-periodically poled two-dimensional nonlinear photonic crystal, we can also produce four-path, five-path, or multipath Dicke states by a single crystal. The multiple-periodically poled two-dimensional nonlinear photonic crystal provides a new method, to the best of our knowledge, for the integrated generation of multipartite quantum light sources.
- Published
- 2019
142. Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1 μm passively Q-switched laser
- Author
-
Xinjie Lü, Du Zhengting, Shining Zhu, Jinlong Xu, Tianqi Zhang, Jian Ning, and Zhenda Xie
- Subjects
Materials science ,business.industry ,Alloy ,Slope efficiency ,Pulse duration ,Saturable absorption ,engineering.material ,Laser ,Q-switching ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Amplitude modulation ,Optics ,law ,Attenuation coefficient ,engineering ,Electrical and Electronic Engineering ,business - Abstract
Due to the composition-dependent properties of two-dimensional (2D) transition metal dichalcogenides (TMDs), alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structures with superior optical and optoelectronic properties. Here, we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2, with larger modulation depth and lower saturable intensity. These advantages allowed the 1064 nm passively Q-switched lasers based on WSe1.4Te0.6 to be more efficient, with pulse duration narrowed to 45%, and slope efficiency increased by 232%. Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.
- Published
- 2019
143. Localization and Steering of Light in One-Dimensional Parity-Time Symmetric Photonic Lattices
- Author
-
Zhenda Xie, Yan-Xiao Gong, Shining Zhu, Xing Wei, Xinjie Lv, and Gang Zhao
- Subjects
Physics ,Computation ,Optical beam ,Optical communication ,Physics::Optics ,General Physics and Astronomy ,Parity (physics) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nonlinear system ,Quantum mechanics ,0103 physical sciences ,Integrated optics ,010306 general physics ,0210 nano-technology ,Photonic lattices - Abstract
We theoretically study the propagation dynamics of input light in one-dimensional mixed linear-nonlinear photonic lattices with a complex parity-time symmetric potential. Numerical computation shows simultaneous localization and steering of the optical beam due to the asymmetric scatter and interplay between Kerr-type nonlinearity and PT symmetry. This may provide a feasible measure for manipulation light in optical communications, integrated optics and so on.
- Published
- 2019
144. Temporal Magnification with Large Observation Duty Ratio Using Synchronized Optical Buffer
- Author
-
Zhenda Xie, Kenneth K. Y. Wong, Shu-Wei Huang, Chee Wei Wong, and Bowen Li
- Subjects
Materials science ,business.industry ,Magnification ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,Optics ,Duty cycle ,Temporal resolution ,0103 physical sciences ,Waveform ,Optical buffer ,0210 nano-technology ,business ,Telecommunications - Abstract
We demonstrate a method to substantially increase the observation duty ratio in temporal-magnification system without sacrificing the temporal resolution. 30% or even 100% observation duty ratio can be achieved on a 10-ns or longer waveform.
- Published
- 2016
145. Gate tunable THz Plasmon generation on graphene based semiconductor chip via backward 2nd order nonlinearity
- Author
-
J. Flor Flores, Xiangfeng Duan, Yunjiang Rao, Chanyeol Choi, Y.-P. Lai, Hao Liu, Yunqiu Wu, Baicheng Yao, Yujia Huang, Zhenda Xie, Chee Wei Wong, Shu-Wei Huang, and Yuan Liu
- Subjects
Materials science ,Condensed Matter::Other ,Terahertz radiation ,Graphene ,business.industry ,Surface plasmon ,Physics::Optics ,chemistry.chemical_element ,01 natural sciences ,Neodymium ,010305 fluids & plasmas ,law.invention ,Blueshift ,Computer Science::Hardware Architecture ,Nonlinear system ,Optics ,chemistry ,law ,Q factor ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Optoelectronics ,010306 general physics ,business ,Plasmon - Abstract
We demonstrate a graphene-alumina-graphene heterostructured semiconductor chip, on which THz plasmons are generated via backward phase-matched 2nd nonlinearity all-optically. The on-chip plasmons are effectively gate tunable, with photon-efficiency ∼10−4, and Q factor > 60.
- Published
- 2016
146. Experimental demonstration of a robust second-order correlation for twin parametric beams above threshold
- Author
-
Shifeng Li, P. Xu, Shining Zhu, Zhenda Xie, Yan-Xiao Gong, Xinjie Lv, Zhaorong Wang, H. B. Lin, and Gang Zhao
- Subjects
Correlation ,Physics ,Optics ,Parametric process ,business.industry ,Order (business) ,Energy conversion efficiency ,business ,Parametric statistics ,Power (physics) - Abstract
We report the first correlation measurement between the twin beams generated by optical parametric process above threshold. This high-visibility correlation can be observed at significant power levels with up to a conversion efficiency of 19.7%.
- Published
- 2016
147. Amplification assisted optical parametric oscillator in the mid-infrared region
- Author
-
Y. H. Liu, Xinjie Lv, Shining Zhu, L. N. Zhao, Gang Zhao, J. Lu, Zhenda Xie, Xiaopeng Hu, and Y. Yuan
- Subjects
Quantum optics ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Superlattice ,Slope efficiency ,Energy conversion efficiency ,General Engineering ,Mid infrared ,General Physics and Astronomy ,Optical parametric amplifier ,Power (physics) ,Optics ,Optical parametric oscillator ,Optoelectronics ,business - Abstract
We demonstrate a high efficiency mid-infrared laser source based on optical parametric oscillator (OPO) assisted by an intracavity optical parametric amplification (OPA). The OPA-assisted-OPO scheme was realized in one piece of commensurable dual-periodic superlattice in which the signal light generated from the OPO process serves as the pump light for the OPA process. A maximum output power of 508 mW at 3.92 μm was achieved under a pump power of 2.85 W at 1.064 μm. The pump-to-idler conversion efficiency is 17.8% and the slope efficiency is 23.8%, and the enhancements of them are 58.9% and 67.6%, respectively, comparing with the standard OPO scheme.
- Published
- 2011
148. Widely tunable optical parametric oscillator in periodically poled congruently grown lithium tantalite whispering gallery mode resonators
- Author
-
Qijin Mo, Qijin Mo, primary, Shifeng Li, Shifeng Li, additional, Yichen Liu, Yichen Liu, additional, Xudong Jiang, Xudong Jiang, additional, Gang Zhao, Gang Zhao, additional, Zhenda Xie, Zhenda Xie, additional, Xinjie Lv, Xinjie Lv, additional, and and Shining Zhu, and Shining Zhu, additional
- Published
- 2016
- Full Text
- View/download PDF
149. Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe2 semimetal films
- Author
-
Zhenda Xie, Yao Li, Zhonghui Nie, Wenbin Gao, Yequan Chen, Chao Zhang, Xiangang Wan, Jun Xu, Lei Huang, Xuefeng Wang, Yongbing Xu, Shining Zhu, Jinlong Xu, Yi Shi, Fengqiu Wang, and Chunhui Zhu
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Saturable absorption ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Semimetal ,Pulsed laser deposition ,010309 optics ,Fiber laser ,0103 physical sciences ,Femtosecond ,Optoelectronics ,Thin film ,0210 nano-technology ,business ,Absorption (electromagnetic radiation) ,Ultrashort pulse - Abstract
WTe2 is a unique material in the family of transition metal dichalcogenides and it has been proposed as a candidate for type-II Weyl semimetals. However, thus far, studies on the optical properties of this emerging material have been significantly hindered by the lack of large-area, high-quality WTe2 materials. Here, we grow a centimeter-scale, highly crystalline WTe2 ultrathin film (∼35 nm) by a pulsed laser deposition technique. Broadband pump-probe spectroscopy (1.2–2.5 μm) reveals a peculiar ultrafast optical response where an initial photo-bleaching signal (lasting ∼3 ps) is followed by a long-lived photoinduced absorption signature. Nonlinear absorption characterization using femtosecond pulses confirms the saturable absorption response of the WTe2 ultrathin films, and we further demonstrated a mode-locked Thulium fiber laser using a WTe2 absorber. Our work provides important insights into linear and nonlinear optical responses of WTe2 thin films.
- Published
- 2018
150. Enhanced saturable absorption of MoS2 black phosphorus composite in 2 μm passively Q-switched Tm: YAP laser
- Author
-
Zhilin Ye, Xiaopeng Hu, Han Zhang, Jinlong Xu, Zhenda Xie, and Yang Xue
- Subjects
Fabrication ,Materials science ,Composite number ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,law.invention ,Nanomaterials ,010309 optics ,Optics ,law ,0103 physical sciences ,Electrical and Electronic Engineering ,business.industry ,Saturable absorption ,021001 nanoscience & nanotechnology ,Laser ,Exfoliation joint ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Thulium ,chemistry ,Optoelectronics ,0210 nano-technology ,business ,Layer (electronics) - Abstract
We report the fabrication of an MoS2 black phosphorus (BP) composite saturable absorber by liquid phase exfoliation and the spin-coating method and further exploitation to build a 2 μm passively Q-switched Tm:YAP laser. Such a composite based Q-switched laser with a duration of 488 ns and corresponding peak power of 85.9 W is obtained, which shows an improved saturable absorption effect than that of single MoS2 (616 ns, 68.7 W) and BP (932 ns, 22.4 W). The results indicate that simple and reasonable fabrication of the vertical composite from two-dimensional atomic layer materials opens up the possibility to create an unprecedented saturable absorber with exciting properties.
- Published
- 2018
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