Design of Plasmonic Perfect Absorbers for Quantum-well Infrared Photodetection

被引：46

作者：

Zhao, Fangyuan ^{[1
,2
,3
]}

Zhang, Chi ^{[1
]}

Chang, Huiting ^{[1
]}

Hu, Xinhua ^{[1
]}

机构：

[1] Fudan Univ, Adv Mat Lab, Dept Mat Sci, Key Lab Micro & Nanophoton Struct,Minist Educ, Shanghai 200433, Peoples R China

[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[3] Fudan Univ, Key Lab Surface Phys, Shanghai 200433, Peoples R China

来源：

PLASMONICS | 2014年 / 9卷 / 06期

关键词：

Perfect absorber; Plasmonic cavity; Quantum-well infrared photodetector; Au grating;

D O I：

10.1007/s11468-014-9755-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Based on analytic formulas and numerical simulations, we propose a plasmonic cavity with a top Au grating and bottom Au film to enhance quantum-well infrared photodetectors (QWIPs) operating at wavelengths between 2 to 30 mu m. By using plasmonic cavity modes, QWIPs can detect light even at normal incidence. With using optimal structural parameters, light can be almost perfectly absorbed by the cavity and over 54 % of the light is absorbed by the QW active region. Compared with the reference structure (without Au layers and with an isotropic active region), the absorption enhancement is over 30 times in the QW active region at normal incidence and remains high value (> 4.5) for p -polarized light in a broad range of incident angle (|oee integral| < 60 (0)).

引用

页码：1397 / 1400

页数：4

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