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241 results on '"Valev, Ventsislav K."'

5. Nanoplastics Detected in Commercial Sea Salt

Author

Ruan, Xuejun, primary, Ao, Jianpeng, additional, Ma, Minglu, additional, Jones, Robin R., additional, Liu, Juan, additional, Li, Kejian, additional, Ge, Qiuyue, additional, Xu, Guanjun, additional, Liu, Yangyang, additional, Wang, Tao, additional, Xie, Lifang, additional, Wang, Wei, additional, You, Wenbo, additional, Wang, Licheng, additional, Valev, Ventsislav K., additional, Ji, Minbiao, additional, and Zhang, Liwu, additional

Published
2024
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9. Thermo-optics of gilded hollow-core fibers.

Author

Kolchanov, Denis S., Machnev, Andrey, Blank, Alexandra, Barhom, Hani, Zhu, Liangquan, Lin, Qijing, Inberg, Alexandra, Rusimova, Kristina R., Mikhailova, Mariia A., Gumennik, Alexander, Salgals, Toms, Bobrovs, Vjačeslavs, Valev, Ventsislav K., Mosley, Peter J., and Ginzburg, Pavel

Published
2024
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11. UV luminescence in Jersey Tiger moths

Author

Andrews, David L., Bain, Angus J., Ambrosio, Antonio, Zachariadis, Michael, Valev, Eva, Valev, Kylian, Lednitzky, Diana, Choi, Hoyeon, Fletcher, Philip, Kelsh, Robert N., and Valev, Ventsislav K.

Published
2024
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14. Dense Arrays of Nanohelices: Raman Scattering from Achiral Molecules Reveals the Near‐Field Enhancements at Chiral Metasurfaces

Author

Jones, Robin R., primary, Miksch, Cornelia, additional, Kwon, Hyunah, additional, Pothoven, Coosje, additional, Rusimova, Kristina R., additional, Kamp, Maarten, additional, Gong, Kedong, additional, Zhang, Liwu, additional, Batten, Tim, additional, Smith, Brian, additional, Silhanek, Alejandro V., additional, Fischer, Peer, additional, Wolverson, Daniel, additional, and Valev, Ventsislav K., additional

Published
2023
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15. Light-induced actuating nanotransducers

Author

Ding, Tao, Valev, Ventsislav K., Salmon, Andrew R., Forman, Chris J., Smoukov, Stoyan K., Scherman, Oren A., Frenkel, Daan, and Baumberg, Jeremy J.

Published
2016

17. Nanoplastics Detected in Commercial Sea Salt

Author

Ruan, Xuejun, primary, Ao, Jianpeng, additional, Jones, Robin, additional, Liu, Juan, additional, Li, kejian, additional, Ge, Qiuyue, additional, Xu, Guanjun, additional, Liu, Yangyang, additional, Wang, Tao, additional, Xie, Lifang, additional, Gong, Kedong, additional, Wang, Wei, additional, Valev, Ventsislav K., additional, Ji, Minbiao, additional, and Zhang, Liwu, additional

Published
2022
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27. Determining the values of second-order surface nonlinearities by measurements with wave plates of different retardations

Author

Valev, Ventsislav K., Foerier, Stijn, and Verbiest, Thierry

Subjects
Dielectric films -- Observations, Dielectric films -- Materials, Thin films -- Observations, Thin films -- Materials, Acoustooptics -- Methods, Astronomy, Physics
Abstract

We measured the second harmonic generation response of a thin film consisting of chiral molecules with four wave plates having different retardation coefficients. By means of the fitting procedure described in a previously reported formalism, we demonstrated that a single set of tensor components of second order surface nonlinearities fits all the data. Our results provide clear experimental evidence for the validity of this method, which can find applications in the studies of chiral structures and achiral anisotropic materials. OCIS codes: 160.1585, 190.4160.

Published
2009

34. Doubly‐Resonant Enhancement of Second Harmonic Generation from a WS2 Nanomesh Polymorph with a Modified Energy Landscape.

Author

Murphy, Alexander W. A., Liu, Zichen, Gorbach, Andrey V., Ilie, Adelina, and Valev, Ventsislav K.

Subjects
SECOND harmonic generation, THIRD harmonic generation, DELOCALIZATION energy, TRANSITION metals, CRYSTAL grain boundaries, NONLINEAR optics
Abstract

Although transition metal dichalcogenides (TMDs, e.g., WS2, WSe2, MoS2, MoSe2) have emerged as highly promising 2D materials for nonlinear optics, they are limited by intrinsically small light‐matter interaction length and (typically) flat‐lying geometries. The first hyperspectral multiphoton analysis of a tridimensional webbed network of densely‐packed stacks (of 1–5 layers) of twisted and/or fused 2D nanosheets of WS2, referred to as "nanomesh", is presented here. The optical second harmonic generation (SHG) is mapped across the three characteristic spectral features (A, B, and C) and two‐photon luminescence and third harmonic generation signatures are established. Compared to flat‐lying WS2 layers, the nanomesh is highly efficient, broadband, and robust against degradation (with main enhancement originating from the C feature, spreading from 850 to 1100 nm), and scalable in terms of growth. The origin of these spectral differences is assigned to hotspots, whose location changes depending on the wavelength of illumination. The main SHG enhancements result from double resonances in an energy landscape modified by in‐built defects (e.g., vacancies and their passivated variants, or grain boundaries) that induce intra‐bandgap energy levels. These characteristics establish the nanomesh as a prime candidate for integration into quantum optical technologies, such as miniaturized devices on chip. [ABSTRACT FROM AUTHOR]

Published
2021
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36. Nonlinear Chiroptical Response of GaAs Nanowires Partially Covered by Au

Author

Belardini, Alessandro, primary, Valev, Ventsislav K., additional, Sibilia, Concita, additional, Collins, Joel, additional, Hooper, David C., additional, Petronijevic, Emilija, additional, Hakkarainen, Teemu, additional, Koivusalo, Eero, additional, Piton, Marcelo Rizzo, additional, Soumalainen, Soile, additional, and Guina, Mircea, additional

Published
2019
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37. Nonlinear circular dichroism in GaAs nanowires partially covered by gold (Conference Presentation)

Author

Belardini, Alessandro, primary, Collins, Joel T., additional, Hooper, David C., additional, Leahu, Grigore, additional, Petronijevic, Emilija, additional, Centini, Marco, additional, Hakkarainen, Teemu, additional, Koivusalo, Eero, additional, Rizzo Piton, Marcelo, additional, Suomalainen, Soile, additional, Guina, Mircea, additional, Valev, Ventsislav K., additional, and Sibilia, Concita, additional

Published
2019
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39. “Hot edges” in an inverse opal structure enable efficient CO2 electrochemical reduction and sensitive in situ Raman characterization

Author

Yang, Yang, primary, Ohnoutek, Lukas, additional, Ajmal, Saira, additional, Zheng, Xiuzhen, additional, Feng, Yiqing, additional, Li, Kejian, additional, Wang, Tao, additional, Deng, Yue, additional, Liu, Yangyang, additional, Xu, Dong, additional, Valev, Ventsislav K., additional, and Zhang, Liwu, additional

Published
2019
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43. Excitation-Energy-Dependent Molecular Beacon Detects Early Stage Neurotoxic Aβ Aggregates in the Presence of Cortical Neurons

Author

Gulácsy, Christina E., primary, Meade, Richard, additional, Catici, Dragana A. M., additional, Soeller, Christian, additional, Pantos, G. Dan, additional, Jones, D. Dafydd, additional, Alibhai, Dominic, additional, Jepson, Mark, additional, Valev, Ventsislav K., additional, Mason, Jody M., additional, Williams, Robert J., additional, and Pudney, Christopher R., additional

Published
2018
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44. Chiral Nanomaterials: Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism (Advanced Optical Materials 14/2018)

Author

Collins, Joel T., primary, Zheng, Xuezhi, additional, Braz, Nuno V. S., additional, Slenders, Eli, additional, Zu, Shuai, additional, Vandenbosch, Guy A. E., additional, Moshchalkov, Victor V., additional, Fang, Zheyu, additional, Ameloot, Marcel, additional, Warburton, Paul A., additional, and Valev, Ventsislav K., additional

Published
2018
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47. Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism

Author

Collins, Joel T., primary, Zheng, Xuezhi, additional, Braz, Nuno V. S., additional, Slenders, Eli, additional, Zu, Shuai, additional, Vandenbosch, Guy A. E., additional, Moshchalkov, Victor V., additional, Fang, Zheyu, additional, Ameloot, Marcel, additional, Warburton, Paul A., additional, and Valev, Ventsislav K., additional

Published
2018
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