Author Affiliations
Abstract
1 Shanghai Key Laboratory of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China
2 Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
Optical frequency combs, which are generated by the cascade of a phase modulator and a Mach–Zehnder intensity modulator, are used as a polychromatic signal source in the terahertz imaging system to improve imaging quality. The interference effect caused by the monochromatic wave has been greatly suppressed. The required optical power in the presented system is as low as ~30% of that in the system using the Er-doped fiber amplifier as a source, which can reduce cost and protect photodiodes from damage. This work provides an effective, low power consumption, low cost, and easy way to realize terahertz imaging with high quality and can be used in future security inspections.
110.6795 Terahertz imaging Chinese Optics Letters
2019, 17(4): 041101
1 上海理工大学光电信息与计算机工程学院, 上海 200093
2 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
设计了一种太赫兹量子阱光电探测器(THz-QWP),并利用该器件研究了多体效应。通过表征和分析器件的光电流谱,发现多体效应改变了器件的峰值响应频率,并且引起了双响应峰现象,从而验证了多体效应能加深有效势阱深度并增大基带与第一激发能级态之间的间距。因此,在THz-QWP的结构设计中,考虑多体效应具有重要意义。
探测器 太赫兹 量子阱 多体效应 光电探测器 光学学报
2017, 37(10): 1004001
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
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。
探测器 太赫兹 量子阱 金属光栅 激光与光电子学进展
2015, 52(9): 092302