Open AccessTwo-color quantum well infrared photodetector simultaneously working at 10—14 μm
Author(s) -
刘小宇,
马文全,
张艳华,
霍永恒,
种明,
陈良惠
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.5720
Subject(s) - quantum well infrared photodetector , photodetector , excited state , photocurrent , ground state , infrared , optoelectronics , wavelength , physics , quantum well , doping , quantum , materials science , optics , atomic physics , quantum mechanics , laser
We have demonstrated a two-color quantum well infrared photodetector (QWIP) exhibiting simultaneous photoresponse with cutoff wavelengths at 11.8 and 14.5 μm, respectively. Strong photocurrent signals are observed at temperature of 77 K. The simultaneous two-color photoresponse is achieved by utilizing a simple design by broadening the width of the quantum well and selecting an appropriate doping density. The two peaks are attributed to the intersubband transitions from the ground state to the first excited state (bound state) and to the fifth excited state (continuum state), respectively.