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Published July 2010 | Published
Journal Article Open

Multispectral Quantum Dots-in-a-Well Infrared Detectors Using Plasmon Assisted Cavities

Abstract

We present the design, fabrication, and characterization, of multi-spectral quantum dots-in-a-well (DWELL) infrared detectors, by the integration of a surface plasmon assisted resonant cavity with the infrared detector. A square lattice and rectangular lattice cavity, formed by modifying the square lattice have been used in this design. By confining the resonant mode of the cavity to detector active region, the detector responsivity and detectivity have been improved by a factor of 5. A spectral tuning of 5.5 to 7.2 μm has been observed in the peak response of the detectors, by tuning the lattice constant of the cavity. Simulations indicate the presence of two modes of absorption, which have been experimentally verified. The use of a rectangular lattice predicts highly polarization sensitive modes in x- and y-direction, which are observed in fabricated detectors. A peak detectivity of 3.1 x 10^9 cm √(Hz)/W was measured at 77 K. This design offers a cost-effective and simple method of encoding spectral and polarization information, in infrared focal plane arrays.

Additional Information

© 2010 IEEE. Manuscript received October 05, 2009; revised December 09, 2009. Current version published March 31, 2010. This work was supported by the AFOSR through its Nano Initiative Program and MURI Program in plasmonics, AFRL, and by the IC Post-Doctoral Program. The authors would like to thank T. Nelson for helpful discussions, R. Perahia for help in the detector fabrication, J. S. Brown for the growth, and S. J. Lee for discussions during characterization.

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August 22, 2023
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