太赫兹量子阱探测器研究  

Research on Terahertz Quantum-Well Photodetectors

作　　者：郭旭光[1] 顾亮亮[1] 符张龙 张戎[1] 谭智勇[1] 曹俊诚[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所太赫兹固态技术重点实验室,上海200050

出　　处：《激光与光电子学进展》2015年第9期285-291,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61176086);国家重大科学仪器设备开发专项(2011YQ150021)

摘　　要：太赫兹量子阱探测器(THz QWP)是一种工作于太赫兹频段的光子型探测器。本文回顾了THz QWP近几年在以下方面取得的主要进展:1)通过考虑多体效应,解决了THz QWP峰值响应频率精确设计及多量子阱能带结构的优化;采用自洽发射-俘获模型,研究了THz QWP电子输运问题。2)提出三种基于金属光栅的THz QWP光耦合器,这些耦合器能有效改变入射光场的极化方向,使之符合量子阱子带跃迁选择定则,并使光场在多量子阱吸收区局域增强,提高耦合效率,从而提高THz QWP的探测灵敏度。3)在THz QWP中,发现纵光学(LO)声子频率处反常光响应峰,采用LO声子辅助光场局域增强模型解释了这一反常响应峰的起源。Terahertz quantum-well photodetectors （THz QWPs） are photon-type detectors working in terahertz regime. Recent progress in the development of terahertz QWPs is reviewed in the following aspects. First, by considering the many-particle effects, the response peak frequency and the band structure of terahertz QWPs are calculated and optimized accurately; the electron transport behavior is explored within the self-consistent emission- capture model. Second, three types of light couplers for terahertz QWPs are introduced. At resonant frequencies, the polarization of the light field is effectively tuned by the light couplers to fulfill the selection rule for intersubband transitions. The electric field intensities in the active multi-quantum-well （MQW） absorption region of terahertz QWPs are also enhanced. Therefore, the sensitivity of terahertz QWPs is improved. Third, the anomalous response peak at the longitudinal optical （LO） phonon frequency of GaAs is found in terahertz QWPs. Such response peak originates from the field enhancement in the MQW absorption layer mediated by LO phonons.

关 键 词：探测器 太赫兹 量子阱 金属光栅 

分 类 号：O472.8[理学—半导体物理]