Quantum well micropillar arrays with low filling factor for enhanced infrared absorption
Received:March 30, 2020  Revised:January 13, 2021  download
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Author NameAffiliationE-mail
YE Xin-Hui School of Materials Science and Engineering University of Shanghai for Science and Technology Shanghai 200093 China
State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China 
yexinhui0506@126.com 
XIE Tian School of Materials Science and Engineering University of Shanghai for Science and Technology Shanghai 200093 China
State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China 
 
XIA Hui State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
LI Ju-Zhu State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China
Mathematics and Science College Shanghai Normal University Shanghai 200234 China 
 
ZHANG Shuai-Jun School of Materials Science and Engineering University of Shanghai for Science and Technology Shanghai 200093 China
State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China 
 
JIANG Xin-Yang State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China
School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China 
 
DENG Wei-Jie State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China
School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China 
 
WANG Wen-Jing State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China
Mathematics and Science College Shanghai Normal University Shanghai 200234 China 
 
LI Yu-Ying State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
LIU Wei-Wei State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
LIU Fang School of Materials Science and Engineering University of Shanghai for Science and Technology Shanghai 200093 China liufang@usst.edu.cn 
LI Tian-Xin State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China txli@mail.sitp.ac.cn 
Abstract:To improve the efficiency of optical coupling and the signal-to-noise ratio of long wavelength quantum well infrared detector(LW-QWIP), we designed and fabricated a quantum well subwavelength micropillar arrays structure targeting at 8.7 μm central wavelength. Different from the reported metal or dielectric microcavity structures, each pillar contains 50 periods of quantum wells and barriers, this, combined with the filling factor lower than 0.18, is expected to considerably suppress the dark current while enhancing the efficiency of light absorption. Infrared spectrum measurement discloses that the micropillar arrays reflect only 8% in the wavelength range of 8~9 μm. Our study offers a practical scheme for sensitive infrared detection at high operation temperature.
keywords:quantum well infrared detector  subwavelength micropillar arrays  filling factor  infrared reflectance spectrum
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Copyright:《Journal of Infrared And Millimeter Waves》