Using lead germanium telluride as a high-index coating material in the mid-wavelength infrared narrow bandpass filters  

作　　者：谢平 李斌 张素英 刘定权 

机构地区：[1]Shanghai Institute of Technical Physics,Chinese Academy of Sciences [2]School of Physical Science and Technology,Shanghai Tech University

出　　处：《Chinese Optics Letters》2015年第12期80-83,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.61178039 and 61306115

摘　　要：In our investigation, lead germanium telluride, which is a pseudo-binary alloy of IV-VI narrow-gap semiconductor compounds of Pb Te and Ge Te, can be used in the fabrication of mid-wavelength infrared narrow bandpass filters as a high-index coating material, due to its high refractive index, lower absorption, and tunability of fundamental absorption edges. It is demonstrated that a half-width of 160 nm and a better rejection ratio can be obtained for a simple 8-layer double cavity filter with a central wavelength at 4 μm, compared with a half-width of 390 nm for those conveniently fabricated using Ge as high-index material.In our investigation, lead germanium telluride, which is a pseudo-binary alloy of IV-VI narrow-gap semiconductor compounds of Pb Te and Ge Te, can be used in the fabrication of mid-wavelength infrared narrow bandpass filters as a high-index coating material, due to its high refractive index, lower absorption, and tunability of fundamental absorption edges. It is demonstrated that a half-width of 160 nm and a better rejection ratio can be obtained for a simple 8-layer double cavity filter with a central wavelength at 4 μm, compared with a half-width of 390 nm for those conveniently fabricated using Ge as high-index material.

关 键 词：Coatings GERMANIUM Infrared radiation PLATING Refractive index Water vapor 

分 类 号：TN713[电子电信—电路与系统]