光学学报, 2018, 38 (3): 0323001, 网络出版: 2018-03-20
基于全反射的波导异质结构单向传输性能研究 
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Study on Unidirectional Transmission Characteristics of Waveguide Heterostructure Based on Total Reflection
光学器件 光波单向传输器 时域有限差分法 光子晶体 全反射界面 波导 optical devices light unidirectional transmission devices finite difference time domain method photonic crystals total reflection interface waveguide
摘要
基于光子晶体异质结构实现光波单向传输在全光网络和光信息处理中有重要意义。基于全反射原理设计了两种由二氧化硅和锗材料构筑的三角晶格光子晶体波导异质结构, 运用时域有限差分法对该结构在宽频带内的单向传输特性进行分析。通过改变正向出射端波导宽度对结构进一步优化, 实现了在异质结构一中, TE模式光波在1458~1517 nm波长范围内正向透射率高于0.8, 透射对比度高于0.9的单向传输；在异质结构二中, TM模式光波在1498~1689 nm波长范围内正向透射率高于0.8, 透射对比度接近于1的单向传输。
Abstract
The unidirectional transmission of light waves based on photonic crystal heterostructures is of great significance in all-optical networks and optical signal processing. Based on the total reflection principle, two kinds of triangular lattice photonic crystal waveguide heterostructures are designed by using silica and germanium materials. The finite difference time domain method is used to analyze the unidirectional transmission performance in a broad bandwidth. The structure is further optimized by changing the waveguide width at the forward exiting end. The results show that in the heterostructure one, the forward transmittance of TE mode wave is higher than 0.8 in the wavelength range from 1458 nm to 1517 nm, and the transmission contrast is higher than 0.9 with unidirectional transmission. In heterostructure two, the forward transmittance of TM mode is higher than 0.8 in the wavelength range from 1498 nm to 1689 nm, and the transmission contrast is close to 1 with unidirectional transmission.
费宏明, 武敏, 刘辉阳, 徐婷, 刘欣, 张明达, 曹斌照, 杨毅彪. 基于全反射的波导异质结构单向传输性能研究[J]. 光学学报, 2018, 38(3): 0323001. Fei Hongming, Wu Min, Liu Huiyang, Xu Ting, Liu Xin, Zhang Mingda, Cao Binzhao, Yang Yibiao. Study on Unidirectional Transmission Characteristics of Waveguide Heterostructure Based on Total Reflection[J]. Acta Optica Sinica, 2018, 38(3): 0323001.
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