高透射率慢光速的光子晶体耦合腔波导的研究

High Transmission and Low Group Velocity of a Photonic Crystal Coupled-Cavity Waveguide

将二维三角晶格光子晶体波导和微腔结构结合,优化设计了一种二维三角晶格光子晶体共振耦合腔波导,运用时域有限差分法(FDTD)模拟共振耦合腔波导TE偏振光的透射谱,通过透射谱得到传输光的透射率和群速度。结果表明,合适参数的二维三角晶格共振耦合腔波导在波长1.551μm处的群速度为c/130、透射率为20.1%,在波长1.502μm处的群速度为c/50、透射率为29.2%。运用平面波展开法(PWE)计算的该波导的能带结构对慢光特性进行了分析。这种慢光特性的光子晶体波导将在光存储、光延迟及光子集成等方面有潜在的应用价值。

A two-dimensional photonic crystal coupled-cavity waveguide was designed and optimized by combining photonic crystal wavguide and cavity,transmission spectra of the waveguide were calculated by using FDTD method,and the transmittance and the group velocity were obtained through the transmission spectra.The calculation results show that a group velocity of vg=c/130 and corresponding transmission of 20.1% can be obtained at wavelength 1.551 μm,and a group velocity of vg=c/50 and transmission of 29.2% was obtained at wavelength 1.502 μm.The slow light in the waveguide was also analyzed by using photonic bandstructure calculated by plane-wave-expansion（PWE） method.The results of the photonic crystal waveguide with high transmission and low group velocity will have potential application in optical storage,optical delay and photonic integration.