Optimization of corrugated-QWIPs for large format, high quantum efficiency, and multi-color FPAs

Kwong Kit Choi, Carlos Monroy, Venkataraman Swaminathan, Theodor Tamir, Ming Leung, John Devitt, David Forrai, Darrel Endres

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Previously, we demonstrated a large format 1024 × 1024 corrugated quantum well infrared photodetector focal plane array (C-QWIP FPA). The FPA has a cutoff at 8.6 μm and is BLIP at 76 K with f/1.8 optics. The pixel had a shallow trapezoidal geometry that simplified processing but limited the quantum efficiency QE. In this paper, we will present two approaches to achieve a larger QE for the C-QWIPs. The first approach increases the size of the corrugations for more active volume and adopts a nearly triangular pixel geometry for larger light reflecting surfaces. With these improvements, QE is predicted to be about 35% for a pair of inclined sidewalk, which is more than twice the previous value. The second approach is to use Fabry-Perot resonant oscillations inside the corrugated cavities to enhance the vertical electric field strength. With this approach, a larger QE of 50% can be achieved within certain spectral regions without using either very thick active layers or anti-reflection coatings. The former approach has been adopted to produce a series single color FPAs, and the experimental results will be discussed in a companion paper. In this paper, we also describe using voltage tunable detector materials to achieve multi-color capability for these FPAs.

    Original languageEnglish (US)
    Title of host publicationInfrared Technology and Applications XXXII
    StatePublished - 2006
    EventInfrared Technology and Applications XXXII - Kissimmee, FL, United States
    Duration: Apr 17 2006Apr 21 2006

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume6206 I
    ISSN (Print)0277-786X


    OtherInfrared Technology and Applications XXXII
    Country/TerritoryUnited States
    CityKissimmee, FL


    • EM modeling
    • FPA
    • Optical coupling
    • QWIP

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering


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