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Featured researches published by Canhui Wang.


symposium on photonics and optoelectronics | 2010

A New Solar Concentrator Based on One-Dimensional Grating

Guohua Liu; Xuechang Ren; Canhui Wang; Xiaoyun Chen; Jianzhong Li

A new way of concentrating sunlight, which is based on one-dimensional grating, and could be used for concentrator photovoltaic, is described. The light changes its direction in the plane perpendicular to the grating direction, the diffracted lights translates through the glass and radiates on the solar cell which is on the edge of the glass. The diffraction efficiency is calculated in theory, and the concentration ratio is estimated.


Proceedings of SPIE, the International Society for Optical Engineering | 2009

Holographic fabrication of periodic structures on silicon as antireflective layers for high efficiency solar cells

Xiaoyun Chen; Xiangsu Zhang; Shou Liu; Xuechang Ren; Canhui Wang

The paper presents the investigation on the anti-reflection property of 2-dimensional periodic structures on silicon surface for high efficiency solar cells. The characteristics of micron-to-submicron periodic surface-relief structures for broadband anti-reflection silicon layers are studied theoretically and experimentally. Theoretical analysis is carried out to determine the appropriate sturcture period. Hexagonal and cross grating structures were fabricated on the surfaces of silicon wafers using hologrpahic and wet etching techniques. Measurement on the silicon wafers with fabricated structures shows significant reduction of surface reflection for the wavelength from 300 nm to 1100 nm.


Proceedings of SPIE, the International Society for Optical Engineering | 2009

Small-angle beam deviation with high resolution using gratings

Canhui Wang; Xuechang Ren; Xiangsu Zhang; Shou Liu; Guohua Liu

Small-angle beam deviation has many applications and is conventionally performed by wedge prisms. The usual method suffers from a disadvantage that the manufacturing tolerances limit the resolution to about an arc second. The paper presents a new technique of using low frequency gratings to realize small-angle beam deviation with higher resolution. By rotating a grating placed in the laser beam path, the deviation of the diffracted light beams can be controlled. Using the proposed method, very small beam deviation angle can be achieved under large grating rotation angle, resulting in high reduction ratio. Theoretical analysis shows that as long as the grating period is large enough, the reduction ratio can be much higher than that given by a wedge prism. The theoretical result has been verified experimentally using a holographic grating with 7.25 μm period placed in a Mach-Zehnder interferometer.


Proceedings of SPIE, the International Society for Optical Engineering | 2009

1x2 demultiplexer for a light waveguide communications system based on a holographic grating

Xuechang Ren; Xiangsu Zhang; Canhui Wang; Shou Liu

2-channel multiplexer/demultiplexer (Muxer/Demuxer) is a key component for bidirectional data traffics applied for optical communication. Up to date various types of Muxer/Demuxer have been proposed and demonstrated. A grating coupler diffracts light into substrates or waveguides, along which light beam propagates by total internal reflection. In addition, one can exploit the dispersive and filtering characteristics of gratings, for dropping or separating one or several wavelengths from one another. When a laser beam containing two wavelengths is striking the surface of the grating with an incident angle within certain range, four diffracted beams will be generated. If two diffracted beams, corresponding to different wavelengths, meet the condition of total internal reflection, they will propagate inside the glass substrate (performs as a waveguide). While the third one cannot meet total reflection condition, and the last one should become the evanescent wave. Therefore it can separate two signals and couple signals to different waveguides. These functions are suited for WDM application and directional couplers. For convenience sake, the visible lights at 458nm and 633nm were used as the incident laser beams. To give a simple sample for 1×2 demultiplexing system, a holographic grating was recorded, with the period around 441nm which was chose discretionally within the certain range. The primary experimental results indicate that the two-wavelength signal can be separated and coupled into the respective waveguide as long as the grating is recorded and operated complying with the certain condition. The average insertion loss and crosstalk of the device were presented in this paper.


Physics Procedia | 2011

Optical Tweezers Array System Based on 2D Photonic Crystals

Xuechang Ren; Canhui Wang; Yanshuang Li; Shaoxin Shen; Shou Liu


Archive | 2011

Solar concentrating method and device based on periodic microstructure

Xuechang Ren; Canhui Wang; Guohua Liu; Shou Liu; Xiangsu Zhang


Archive | 2011

Novel holographical optical tweezer device based on Talbot effect

Canhui Wang; Xuechang Ren; Guohua Liu; Shou Liu; Xiangsu Zhang


Archive | 2011

Periodic microstructure-based solar concentrator

Guohua Liu; Canhui Wang; Xuechang Ren; Shou Liu; Xiangsu Zhang


Archive | 2011

Novel holographic optical tweezers system based on Talbot effect

Xuechang Ren; Canhui Wang; Guohua Liu; Shou Liu; Xiangsu Zhang


Archive | 2010

Holographic grating type 1 multiplying 2 waveguide wave separator and manufacturing method thereof

Xuechang Ren; Shou Liu; Xiangsu Zhang; Canhui Wang

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