一维Al／SrF2低温超导体-电介质光子晶体能带结构

The photonic band structure of one-dimensional Al/SrF_2 low temperature superconductor-dielectric photonic crystal

基于二流体电子模型和平面波展开法,计算了一维A l/SrF2超导体-电介质光子晶体的能带结构。结果表明:随着超导层厚度的增加,第一光子带隙中心频率和截止频率均发生蓝移,且第一带隙宽度逐渐增加到一个峰值后又逐渐变窄。更重要的是,在低于临界温度的超低温环境中,温度的微小变化,对该类光子晶体的带隙宽度、中心频率以及截止频率均有明显的调制作用。

The photonic band structure of one -dimensional （1 D） AL/SrF2 low temperature superconductor -dielectric photonic crystal （ PC ） was calculated numerically based on the plane - wave expansion method. The two - fluid model was adopted to describe the dielectric properties of the low temperature superconducting system. The simulation results clearly reveal both photonic band gap and a cutoff frequency can be modulated through the thicknesses of the superconductor layers. It is more interesting that with a small variation of ambient temperature, the photonic band gap and a cutoff frequency can be obviously modulated. This work would be of value in the design of photoelectric device for potential applications in extreme low - temperature environment.