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填充率渐变引起的能带结构和等频面结构的变化是填充率渐变型波状结构二维(2D)光子晶体(PC)产生光路转弯现象的根本原因,由于TM模和TE模在能带结构上存在差异,光路转弯现象就具有明显的偏振选择特性,能够实现归一化频率a/λ为0.29~0.33的偏振分束。利用时域有限差分(FDTD)法模拟了TM模的U型转弯波导,发现出射光位置对入射波长和入射角的变化很敏感,位移变化量分别达到0.38μm/10 nm和0.29μm/(°)。利用TM模的U型转弯波导构建了新型的平行平面谐振腔,并指出由填充率渐变型波状结构二维光子晶体和一维多层薄膜构成的混合结构在光分束和抑制光束发散方面的作用及其在平行平面谐振腔中的潜在应用。
The change of the band structure and the equipotential surface structure caused by the gradual change of the filling rate is the fundamental reason of the optical path turning phenomenon caused by the two-dimensional (2D) photonic crystal (PC) with a gradual wavy filling structure. Since the TM mode and the TE mode have a great influence on the band structure There is a difference between the light path turn phenomenon has obvious polarization selection characteristics, to achieve the normalized frequency a / λ 0.29 ~ 0.33 of the polarization beam splitter. The finite-difference time-domain (FDTD) method was used to simulate the TM mode U-turn waveguide. It was found that the position of the emitted light is sensitive to the variation of the incident wavelength and incident angle. The variation of the displacement is 0.38μm / 10nm and 0.29μm / ). A new type of parallel planar resonant cavity is constructed by using TM mode U-turn waveguide. It is pointed out that the hybrid structure consisting of a two-dimensional photonic crystal filled with a gradual wavy structure and a one-dimensional multi-layer thin film has the advantages in optical splitting and suppression of beam divergence Role and Its Potential Applications in a Parallel Plane Cavity.