Spectrally adaptive infrared photodetectors with bias-tunable quantum dots
JOSA B, Vol. 21, Issue 1, pp. 7-17 (2004)
http://dx.doi.org/10.1364/JOSAB.21.000007
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Abstract
Quantum-dot infrared photodetectors (QDIPs) exhibit a bias-dependent shift in their spectral response. In this paper, a novel signal-processing technique is developed that exploits this bias-dependent spectral diversity to synthesize measurements that are tuned to a wide range of user-specified spectra. The technique is based on two steps: The desired spectral response is first optimally approximated by a weighted superposition of a family of bias-controlled spectra of the QDIP, corresponding to a preselected set of biases. Second, multiple measurements are taken of the object to be probed, one for each of the prescribed biases, which are subsequently combined linearly with the same weights. The technique is demonstrated to produce a unimodal response that has a tunable FWHM (down to Δλ~0.5 μm) for each center wavelength in the range 3–8 μm, which is an improvement by a factor of 4 over the spectral resolution of the raw QDIP.
© 2004 Optical Society of America
OCIS Codes
(020.6580) Atomic and molecular physics : Stark effect
(040.0040) Detectors : Detectors
(040.3060) Detectors : Infrared
(040.5570) Detectors : Quantum detectors
(040.6070) Detectors : Solid state detectors
(160.6000) Materials : Semiconductor materials
(280.0280) Remote sensing and sensors : Remote sensing and sensors
Citation
Ünal Sakoğlu, J. Scott Tyo, Majeed M. Hayat, Sunil Raghavan, and Sanjay Krishna, "Spectrally adaptive infrared photodetectors with bias-tunable quantum dots," J. Opt. Soc. Am. B 21, 7-17 (2004)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-21-1-7
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