Infrared antennas coupled to lithographic Fresnel zone plate lenses

    Authors

    F. J. Gonzalez; J. Alda; B. Ilic;G. D. Boreman

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    MICROBOLOMETERS; Optics

    Abstract

    Several designs for Fresnel zone plate lenses (FZPLs) to be used in conjunction with antenna-coupled infrared detectors have been fabricated and tested. The designs comprise square and circular FZPLs with different numbers of Fresnel zones working in transmissive or reflective modes designed to focus infrared energy on a square-spiral antenna connected to a microbolometer. A 163x maximum increase in response was obtained from a 15-zone circular FZPL in the transmissive mode. Sensor measurements of normalized detectivity D* resulted in a 2.67x increase with FZPLs compared with measurements made of square-spiral antennas without FZPLs. The experimental results are discussed and compared with values obtained from theoretical calculations. (C) 2004 Optical Society of America.

    Journal Title

    Applied Optics

    Volume

    43

    Issue/Number

    33

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    6067

    Last Page

    6073

    WOS Identifier

    WOS:000225531600001

    ISSN

    1559-128X

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