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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29823–29837

Continuous time-varying biasing approach for spectrally tunable infrared detectors

Woo-Yong Jang, Majeed M. Hayat, Payman Zarkesh-Ha, and Sanjay Krishna  »View Author Affiliations

Optics Express, Vol. 20, Issue 28, pp. 29823-29837 (2012)

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In a recently demonstrated algorithmic spectral-tuning technique by Jang et al. [Opt. Express 19, 19454-19472, (2011)], the reconstruction of an object’s emissivity at an arbitrarily specified spectral window of interest in the long-wave infrared region was achieved. The technique relied upon forming a weighted superposition of a series of photocurrents from a quantum dots-in-a-well (DWELL) photodetector operated at discrete static biases that were applied serially. Here, the technique is generalized such that a continuously varying biasing voltage is employed over an extended acquisition time, in place using a series of fixed biases over each sub-acquisition time, which totally eliminates the need for the post-processing step comprising the weighted superposition of the discrete photocurrents. To enable this capability, an algorithm is developed for designing the time-varying bias for an arbitrary spectral-sensing window of interest. Since continuous-time biasing can be implemented within the readout circuit of a focal-plane array, this generalization would pave the way for the implementation of the algorithmic spectral tuning in focal-plane arrays within in each frame time without the need for on-sensor multiplications and additions. The technique is validated by means of simulations in the context of spectrometry and object classification while using experimental data for the DWELL under realistic signal-to-noise ratios.

© 2012 OSA

OCIS Codes
(040.3060) Detectors : Infrared
(040.5160) Detectors : Photodetectors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(150.1135) Machine vision : Algorithms

ToC Category:

Original Manuscript: September 18, 2012
Revised Manuscript: November 20, 2012
Manuscript Accepted: November 21, 2012
Published: December 21, 2012

Woo-Yong Jang, Majeed M. Hayat, Payman Zarkesh-Ha, and Sanjay Krishna, "Continuous time-varying biasing approach for spectrally tunable infrared detectors," Opt. Express 20, 29823-29837 (2012)

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