Design and analysis of resonant cavity-enhanced quantum ring inter-subband photodetector with resonant tunneling barriers for terahertz detection

被引：0
|
作者：
Mahdi Zavvari [1 ]
Mohammad Karimi [2 ]
Kambiz Abedi [3 ]
机构：
[1] Department of Electrical Engineering,Urmia Branch,Islamic Azad University
[2] Department of Electrical Engineering,Ahar Branch,Islamic Azad University
[3] Department of Electrical Engineering,Faculty of Electrical and Computer Engineering,Shahid Beheshti
来源：
红外与毫米波学报 | 2014年 / 33卷 / 06期
关键词：
quantum ring photodetector; resonant cavity; detectivity; distributed bragg reflector; resonant tunneling barrier;
D O I：
暂无
中图分类号：
O441 [电磁学];
学科分类号：
0809 ;
摘要：
The effect of resonant cavity structure on the performance operation of In As/Ga As quantum ring intersubband photodetector is studied for detection of terahertz radiations range.In order to confinement of optical field w ithin active region and consequently enhancement in responsivity of device,tw o periods of Al2O3/Ga As distributed bragg reflectors are used as bottom dielectric mirror and a thin layer of Au material as top mirror of device.For further improvement in detectivity,Al0.3Ga0.7As/In0.3Ga0.7As resonant tunneling barriers are included in absorption layers to reduce dark current of device.Proposed photodetector show s a peak responsivity of about 0.4（A/W）and quantum efficiency of 1.2%at the w avelength of 80μm（3.75 THz）.Furthermore,specific detectivity（D*）of device is calculated and results are compared to conventional quantum ring inter-subband photodetector.Results predict a D*of1011（cm.Hz1/2/W）for device at T=80 K and V=0.4 V w hich is tw o orders of magnitude higher than that of conventional QRIPs.
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页码：571 / 576
页数：6
相关论文
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