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A multicolor, broadband (5-20 mu m), quaternary-capped InAs/GaAs quantum dot infrared photodetector

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Title A multicolor, broadband (5-20 mu m), quaternary-capped InAs/GaAs quantum dot infrared photodetector
 
Creator ADHIKARY, S
AYTAC, Y
MEESALA, S
WOLDE, S
PERERA, AGU
CHAKRABARTI, S
 
Subject OPTICAL-PROPERTIES
TEMPERATURE
8-BAND
 
Description An InAs/GaAs quantum dot infrared photodetector with strong, multicolor, broadband (5-20 mu m) photoresponse is reported. Using a combined quaternary In0.21Al0.21Ga0.58As and GaAs capping that relieves strain and maintains strong carrier confinement, we demonstrate a four color infrared response with peaks in the midwave-(5.7 mu m), longwave-(9.0 and 14.5 mu m), and far-(17 mu m) infrared regions. Narrow spectral widths (7% to 9%) are noted at each of these wavelengths including responsivity value similar to 95.3mA/W at 14.5 mu m. Using strain field and multi-band k.p theory, we map specific bound-to-bound and bound-to-quasibound transitions to the longwave and midwave responses, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773373]
 
Publisher AMER INST PHYSICS
 
Date 2014-10-17T06:11:18Z
2014-10-17T06:11:18Z
2012
 
Type Article
 
Identifier APPLIED PHYSICS LETTERS, 101(26)
http://dx.doi.org/10.1063/1.4773373
http://dspace.library.iitb.ac.in/jspui/handle/100/16151
 
Language en