Theoretical Investigation on Microcavity Coupler for Terahertz Quantum-Well Infrared Photodetectors

被引：2

作者：

Guo, Xuguang ^{[1
]}

Ren, Yuxiang ^{[1
]}

Zhang, Guixue ^{[1
]}

Yu, Anqi ^{[1
,3
]}

Chen, Xiaoshuang ^{[2
]}

Zhu, Yiming ^{[1
,3
]}

机构：

[1] Univ Shanghai Sci & Technol, Terahertz Technol Innovat Res Inst, Terahertz Spectrum & Imaging Technol Cooperat Inn, Shanghai Key Lab Modern Opt Syst, Shanghai 200093, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

[3] Tongji Univ, Shanghai Inst Intelligent Sci & Technol, Shanghai 200092, Peoples R China

来源：

IEEE ACCESS | 2020年 / 8卷

基金：

中国国家自然科学基金;

关键词：

Terahertz photodetectors; microcavity; critical coupling; grating; waveguide; quantum well; METAMATERIAL; ABSORPTION; EFFICIENCY; DETECTORS;

D O I：

10.1109/ACCESS.2020.3025349

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Resonant behaviors and absorption enhancement of metallic grating-dielectric-metal (GDM) microcavity are theoretically investigated. The GDM structure is treated as periodic unit cells of two serially-connected metal-dielectric-metal (MDM) and air-dielectric-metal (ADM) waveguide resonators. The resonant modes can be divided into three types: the LC mode, the TEM modes supported by the MDM waveguide resonator, and the TEM-TM hybrid modes supported by the whole GDM structure. The resonant frequencies of LC and TEM modes are independent on a small incident oblique angle. However, for the TEM-TM hybrid modes, each mode splits into two branches with non-zero incident angles. Based on the temporal coupled-mode theory, the intersubband absorption efficiency of multi quantum wells inserted into the GDM microcavity is calculated and discussed qualitatively. We point out that the condition of critical coupling is not the optimal condition for intersubband absorption efficiency when the metallic loss cannot be neglected. An optimization procedure is given for the design of high performance GDM-microcavity-coupled terahertz quantum-well infrared photodetectors.

引用

页码：176149 / 176157

页数：9

共 40 条

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