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基于自动复形技术,在1·48—1·52μm的近红外波段设计了可以实现全角度偏振分束(TM模透过,TE模反射)的波状膜层二维光子晶体结构.从能带角度解释了全角度偏振分束的原理.波状膜层倾角θ和a-Si单层膜厚T分别可以在38°—49°和0·14—0·15μm的范围内变动,不影响全角度的偏振特性.对波状膜层进行了变形,针对波长1·28—1·31μm设计了宽角度偏振分束的箭羽型二维光子晶体结构.对比两种结构的能带,阐明了二维光子晶体偏振分束器光线入射角范围的拓宽与能带结构变化的关系.能带计算全部采用平面波展开算法.
Based on the automatic reconfiguration technique, a two-dimensional photonic crystal structure of a wave-shaped layer capable of realizing full-angle polarization splitting (TM mode transmission and TE mode reflection) was designed in the near infrared band of 1.48-1.22 μm, Angle explains the principle of full-angle polarization beam splitting.Wave angle θ and a-Si monolayer thickness T can be varied in the range of 38 ° -49 ° and 0 · 14-0 · 15μm, respectively, without affecting the full angle Of the polarization characteristics of the wave-shaped film was deformed, for a wavelength of 1.28-1 · 31μm wide angle polarization beam splitter designed two-dimensional photonic crystal structure.Compared the energy band of the two structures, illustrates the two-dimensional The relationship between the broadening of the incident angle range of photonic crystal polarization beam splitter and the change of the energy band structure. The band calculation is based on the plane wave expansion algorithm.