Spectrally adaptive infrared photodetectors with bias-tunable quantum dots

Unal Sakoǧlu, J Scott Tyo, Majeed M. Hayat, Sunil Raghavan, Sanjay Krishna

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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.

Original languageEnglish (US)
Pages (from-to)7-17
Number of pages11
JournalJournal of the Optical Society of America B: Optical Physics
Volume21
Issue number1
DOIs
Publication statusPublished - 2004
Externally publishedYes

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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