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10 results on '"Hu, Chunguang"'

2. Excitons Enabled Topological Phase Singularity in a Single Atomic Layer

Author

Ma, Guoteng, Shen, Wanfu, Sanchez, Daniel Soy, Yu, Yu, Wang, Han, Sun, Lidong, Wang, Xinran, and Hu, Chunguang

Abstract

The nontrivial and rigorous Heaviside phase jump behavior of phase singularities (PSs) empowers exotic topological modes and widely divergent nature compared to neighboring points, which has attracted great attention in condensed matter physics as well as applications in photonics and ultrasensitive sensors. Here we demonstrate the universal existence of a family of topologically protected PSs generated from exciton resonances of single-atom layers. We obtain the PSs by coating the transition metal dichalcogenide (TMDC) monolayers on a nonabsorptive semi-infinite substrate without surface plasmon effect or other assisted resonators, which exploits the benefits of both exciton-dominated enhancement and peculiarities of the singular phase. We show that a refractive indices matched transparent substrate enables TMDC monolayers to exhibit topologically protected zero reflection accompanied by a perfect Heaviside π-phase jump at strong light adsorptions, which can be utilized to radically reduce the thickness of PS-based devices to a single atomic layer. By using the TMDC monolayer-based PSs for refractive index biosensors, we demonstrate its superior phase sensitivity at a level of 104degrees per refractive index unit and detection of bioactive bacteria, respectively, which is comparable to the cutting-edge surface plasmon and Fabry–Perot resonance sensors. Our proof-of-concept results offer experimental and theoretical insights into a single atomic playground for flat singular optics and label-free biosensing technologies.

Published
2023
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4. In-Plane Optical and Electrical Anisotropy of 2D Black Arsenic

Author

Zhong, Mianzeng, primary, Meng, Haotong, additional, Liu, Sijie, additional, Yang, Huai, additional, Shen, Wanfu, additional, Hu, Chunguang, additional, Yang, Juehan, additional, Ren, Zhihui, additional, Li, Bo, additional, Liu, Yunyan, additional, He, Jun, additional, Xia, Qinglin, additional, Li, Jingbo, additional, and Wei, Zhongming, additional

Published
2020
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5. Magnetism and Optical Anisotropy in van der Waals Antiferromagnetic Insulator CrOCl

Author

Zhang, Tianle, primary, Wang, Yimeng, additional, Li, Hexuan, additional, Zhong, Fang, additional, Shi, Jia, additional, Wu, Minghui, additional, Sun, Zhaoyang, additional, Shen, Wanfu, additional, Wei, Bin, additional, Hu, Weida, additional, Liu, Xinfeng, additional, Huang, Li, additional, Hu, Chunguang, additional, Wang, Zhongchang, additional, Jiang, Chengbao, additional, Yang, Shengxue, additional, Zhang, Qing-ming, additional, and Qu, Zhe, additional

Published
2019
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6. The Opposite Anisotropic Piezoresistive Effect of ReS2

Author

An, Chunhua, primary, Xu, Zhihao, additional, Shen, Wanfu, additional, Zhang, Rongjie, additional, Sun, Zhaoyang, additional, Tang, Shuijing, additional, Xiao, Yun-Feng, additional, Zhang, Daihua, additional, Sun, Dong, additional, Hu, Xiaodong, additional, Hu, Chunguang, additional, Yang, Lei, additional, and Liu, Jing, additional

Published
2019
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9. Mechanical and Electrical Anisotropy of Few-Layer Black Phosphorus

Author

Tao, Jin, primary, Shen, Wanfu, additional, Wu, Sen, additional, Liu, Lu, additional, Feng, Zhihong, additional, Wang, Chao, additional, Hu, Chunguang, additional, Yao, Pei, additional, Zhang, Hao, additional, Pang, Wei, additional, Duan, Xuexin, additional, Liu, Jing, additional, Zhou, Chongwu, additional, and Zhang, Daihua, additional

Published
2015
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10. Strain and Interference Synergistically Modulated Optical and Electrical Properties in ReS 2 /Graphene Heterojunction Bubbles.

Author

Chen Y, Wang Y, Shen W, Wu M, Li B, Zhang Q, Liu S, Hu C, Yang S, Gao Y, and Jiang C

Abstract

Two-dimensional (2D) material bubbles, as a straightforward method to induce strain, represent a potentially powerful platform for the modulation of different properties of 2D materials and the exploration of their strain-related applications. Here, we prepare ReS 2 /graphene heterojunction bubbles (ReS 2 /gr heterobubbles) and investigate their strain and interference synergistically modulated optical and electrical properties. We perform Raman and photoluminescence (PL) spectra to verify the continuously varying strain and the microcavity induced optical interference in ReS 2 /gr heterobubbles. Kelvin probe force microscopy (KPFM) is carried out to explore the photogenerated carrier transfer behavior in both strained ReS 2 /gr heterobubbles and ReS 2 /gr interfaces, as well as the oscillation of surface potential caused by optical interference under illumination conditions. Moreover, the switching of in-plane crystal orientation and the modulation of optical anisotropy of ReS 2 /gr heterobubbles are observed by azimuth-dependent reflectance difference microscopy (ADRDM), which can be attributed to the action of both strain effect and interference. Our study proves that the optical and electrical properties can be effectively modulated by the synergistical effect of strain and interference in a 2D material bubble.

Published
2022
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