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《Acta Optica Sinica》 2008-01
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Filling-Factor Graded Wavelike Two-Dimensional Photonic Crystals

Li Yiyu Gu Peifu Wang Baoqing Zheng Zhenrong Liu Xu(State Key Laboratory for Modern Optical Instrumentation,Zhejiang University,Hangzhou,Zhejiang 310027,China)  
The light-path bending phenomenon in filling-factor graded wavelike two-dimensional(2D) photonic crystals(PC) is due to the gradual modifications of the band structure and iso-frequency surface.Because of the band structure difference between TM and TE mode,the light-path bending phenomenon is polarization dependent,which is suitable for the polarization splitter in the normalized frequency a/λ region from 0.29~0.33.In the U-shaped bending waveguide of TM mode,the position of the emergent light is very sensitive to the incident wavelength and incident angle.The simulations with finite-difference time-domain(FDTD) method show that the sensitivities are 0.38 μm/10 nm and 0.29 μm/(°),respectively.The plane-parallel resonant cavity is built up in theory with the U-shaped bending waveguide for TM mode.The beam splitting and convergence effect are also discussed for the structure composed of filling-factor graded wave-like 2D-PC and one-dimensional multilayer thin films.This kind structure has the potential application in the plane-parallel resonant cavity.
【Fund】: 国家自然科学基金(60608014)资助的课题
【CateGory Index】: O734
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