可用于红外探测器的自组织量子线及其带间和子带间光学跃迁

Intersubband and intraband transitions of self-assembled quantum wires for the Infrared detectors

研究了自组织量子线Ga1 -xInxAs的结构、应力分布及其光学性质 .模拟了微应力导致的横向成序及其导引短周期超晶格形成量子线的过程 ,并计算出量子线在原子尺度上的微应力分布 .这里考虑了价带各向异性、带间混合及局域应力分布对光学性质的作用 .研究发现自组织量子线具有应用于正入射红外探测器的良好光学特性 .结果显示当量子线的周期长度为 15到 30nm时 ,导带子带间跃迁波长处在 10到 2 0 μm ,这正是红外探测器的理想工作范围 .同时 ,带间吸收波长在中红外范围 ,它提供了红外探测器的另一个窗口 .

This paper have studied the structures, microstrain distributions, and optical properties of self - assembled quantum wires Gal - In. As made of short - period superlattices with strain induced lateral ordering. The research has taken into account of valence - band anisotropy, band mixing and effects due to microstrain distributions at the atomistic level. The results show that the self-assembled QWRs have favorable optical properties for application in infrared detection with normal incidence. The wavelength for subband transitions ranges from 10 to 20mum with the length of QWR period varying from 15 to 30nm. The wavelength for inter - band absorption is in the mid-IR range.