压强调控的太赫兹反射器的设计

Design of pressure-controlled terahertz reflectors

基于一维光子晶体air/(AB)N/air(其中A为GaAs,B为SiO2)的结构设计了简单的太赫兹反射器,并用传输矩阵法对该结构的反射特性进行了TE与TM两种模式电磁波的理论推导与数值模拟仿真研究.利用结构中只有GaAs的介电常数能被外部压强进行调节,通过理论计算与数值仿真,分别对GaAs的厚度、TE与TM两种模式电磁波的入射角和外部压强等参数进行了其反射特性研究.理论计算与数值模拟仿真的结果表明,基于一维光子晶体air/(AB)N/air的结构能制备成外部压强调控的大角度和全向性的太赫兹反射器.

This paper designs a simple terahertz reflector based on one-dimensional photonic crystal structure of air/(AB)N/air,where A is GaAs and B is SiO2.By using the transfer matrix method,the theoretical derivation and numerical simulation of TE and TM mode electromagnetic waves are carried out for the reflection characteristics of the structure.By theoretical calculation and numerical simulation,the reflection characteristics of TE and TM electromagnetic waves are studied respectively by the thickness of semiconductor GaAs,incident angle and external pressure,due to the fact that semiconductor GaAs can be adjusted by external pressure in this structure.The results of theoretical calculation and numerical simulation show that the structure of air/(AB)N/air based on one-dimensional photonic crystal can be used to prepare the pressure-controlled omnidirectional terahertz reflector with large angles.