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134 results on '"Teng, Jing Hua"'

34. Influence of Plasmonic Effect on the Upconversion Emission Characteristics of NaYF4Hexagonal Microrods

Author

Wang, Ting, Siu, Chun Kit, Yu, Huan, Wang, Yunfeng, Li, Siqi, Lu, Wei, Hao, Jianhua, Liu, Hong, Teng, Jing Hua, Lei, Dang Yuan, Xu, Xuhui, and Yu, Siu Fung

Abstract

The influence of plasmonic effect on the upconversion emission characteristics of Yb3+–Er3+–Tm3+tridoped β-NaYF4hexagonal microrods is studied. Upconversion spontaneous emission can be improved by 10 times if the microrod is deposited on an Ag-coated substrate. The enhancement is also dependent on the emission wavelength and the polarization of the excitation source. Furthermore, upconversion lasing is supported by the geometry of the microrods via the formation of whispering gallery modes. The corresponding excitation threshold can also be reduced by 50% through the influence of plasmonic effect, the coupling between the whispering gallery modes and the surface plasmonic resonance modes.

Published
2018
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45. All-Optical Chirality-Sensitive Sorting viaReversible Lateral Forces in Interference Fields

Author

Zhang, Tianhang, Mahdy, Mahdy Rahman Chowdhury, Liu, Yongmin, Teng, Jing Hua, Lim, Chwee Teck, Wang, Zheng, and Qiu, Cheng-Wei

Abstract

Separating substances by their chirality faces great challenges as well as opportunities in chemistry and biology. In this study, we propose an all-optical solution for passive sorting of chiral objects using chirality-dependent lateral optical forces induced by judiciously interfered fields. First, we investigate the optical forces when the chiral objects are situated in the interference field formed by two plane waves with arbitrary polarization states. When the plane waves are either linearly or circularly polarized, nonzero lateral forces are found at the particle’s trapping positions, making such sideways motions observable. Although the lateral forces have different magnitudes on particles with different chirality, their directions are the same for opposite handedness particles, rendering it difficult to separate the chiral particles. We further solve the sorting problem by investigating more complicated polarization states. Finally, we achieve the chiral-selective separation by illuminating only one beam toward the chiral substance situated at an interface between two media, taking advantage of the native interference between the incident and reflective beams at the interface. Our study provides a robust and insightful approach to sort chiral substances and biomolecules with plausible optical setups.

Published
2017
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48. A Micromachined Reconfigurable Metamaterial via Reconfiguration of Asymmetric Split‐Ring Resonators

Author

Fu, Yuan Hsing, primary, Liu, Ai Qun, additional, Zhu, Wei Ming, additional, Zhang, Xu Ming, additional, Tsai, Din Ping, additional, Zhang, Jing Bo, additional, Mei, Ting, additional, Tao, Ji Fang, additional, Guo, Hong Chen, additional, Zhang, Xin Hai, additional, Teng, Jing Hua, additional, Zheludev, Nikolay I., additional, Lo, Guo Qiang, additional, and Kwong, Dim Lee, additional

Published
2011
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50. Switchable Magnetic Metamaterials Using Micromachining Processes

Author

Zhu, Wei Ming, primary, Liu, Ai Qun, additional, Zhang, Xu Ming, additional, Tsai, Din Ping, additional, Bourouina, Tarik, additional, Teng, Jing Hua, additional, Zhang, Xin Hai, additional, Guo, Hong Chen, additional, Tanoto, Hendrix, additional, Mei, Ting, additional, Lo, Guo Qiang, additional, and Kwong, Dim Lee, additional

Published
2011
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