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Towards an optical coupler using fine-wire:a study of the photovoltaic effect of a heterojunction formed in a single fine-wire of tungsten oxides

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Chinese Physics B 2010年第3期19卷 557-562页

作者：陈尚辉陈建邓少芝许宁生 State Key Laboratory of Optoelectronic Materials and Technologies and Guangdong Province Key Laboratory for Display Material and TechnologySchool of Physics and EngineeringSunYat-Sen University

Nanodevices using the photovoltaic effect of a single nanowire have attracted growing interest. In this paper, we consider potential applications of the photovoltaic effect to optical signal coupling and optical power transmission, and report on the realization of a heterojunction formed between WO2 and WO3 in a fine-wire having a diameter on the micrometer scale. Using a laser beam of 514.5 nm as a signal source, the WO2-WO3 heterojunction yields a maximum output power of up to 37.4 pico watt per heterojunction. Fast responses （less than a second） of both photovoltaic voltage and current are also observed. In addition, we demonstrate that it is a simple and effective way to adapt a commercial Raman spectrometer for the combined functions of fabrication, material characterization and photovottaic measurement of an optical signal coupler and optical power transmitter based on a fine-wire. Our results show an attractive perspective of developing nanowire or fine-wire elements for coupling optical signals into and for powering a nanoelectronic or nano-optoelectronic integrated circuit that works under the condition of preventing it from directly electrically connecting with the optical coupler.

关键词： optical coupler heterojunction tungsten oxide fine-wire photovoltaic

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Floquet control of the gain and loss in a PT-symmetric optical coupler

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Frontiers of physics 2017年第1期12卷 99-105页

作者： Yi Wu Bo Zhu Shu-Fang Hu Zheng Zhou Hong-Hua Zhong Department of Physics Engineering University of CAPF Xi'an 710086 China School of Physics and Astronomy Sun Yat-Sen University (Zhuhai Campus) Zhuhai 519082China Institute of Mathematics and Physics Central South University of Forestry and Technology Changsha 410004 China Department of Physics Hunan Institute of Technology Hengyang 421002 China

Controlling the balanced gain and loss in a PT-symmetric system is a rather challenging task. Utilizing Floquet theory, we explore the constructive role of periodic modulation in controlling the gain and loss of a PT-symmetric optical coupler. It is found that the gain and loss of the system can be manipulated by applying a periodic modulation. Purther, such an original non-Hermitian system can even be modulated into an effective Hermitian system derived by the high-frequency Floquet method. Therefore, compared with other PT- symmetry control schemes, our protocol can modulate the unbroken PT-symmetric range to a wider parameter region. Our results provide a promising approach for controlling the gain and loss of a realistic system.

关键词： PT- symmetry periodic modulation optical coupler

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Performance Study of Silica-on-Silicon Based Multimode Interference （MMI） optical coupler

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Photonic Sensors 2014年第1期4卷 34-42页

作者： A. Zahed Chowdhury (1) 1. Department of Applied Physics Electronics and Communication Engineering University of Chittagong Chittagong 4331 Bangladesh

In recent years, the silica-on-silicon based multimode interference （MMI） optical waveguide is an interesting research topic. It is being advanced various researches on the silica based MMI coupler. This paper represents the considerations of the optimal design of the silica-on-silicon based MMI optical coupler for better performance. For that, we have illustrated the simulation results on a particular case of the 4x4 silica-on-silicon based MMI coupler. From the simulation results, it is seen that the performance of the MMI coupler depends on multiple width and length combinations of the MMI waveguide. The results also show that the width of the multimode waveguide could not be too small or too large for optimal performance, and at the widths, 100~tm, 120~tm and 130~tm, the performance could be optimized and be almost 0.62 - 0.64 in a given length range. Finally, the results have been compared with the optical coupler presently available in the market and show that the silica-on-silicon based MMI coupler is much more efficient in terms of losses and the performance associated with it and the size of the coupler.

关键词： optical coupler planar lightwave circuits (PLCs) silica-on-silicon waveguide multimode interference(MMI) coupler performance (PF)

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Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler

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Chinese Physics B 2017年第12期26卷 324-331页

作者：时坚马瑞琼段作梁梁猛柴宝玉董军 School of Electronic Engineering Xian University of Posts and Telecommunications Xian 710121 China

We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency process. The results show that although the two-waveguide coupler with a cubically bent axis has not aperiodic structure, it acts as a chirped quasi-phase-matching （QPM） grating and corrects the relative phase between the two supermodes in the curved coupler system. We present a scheme about how to choose the parameters to design the curved beam splitter.

关键词： optical coupler adiabatic passage non-adiabatic passage Bloch vector

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