Long-wave infrared surface plasmon grating coupler

    Authors

    J. W. Cleary; G. Medhi; R. E. Peale;W. R. Buchwald

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    DOPED SILICON; ANOMALIES; LIGHT; SILICIDES; Optics

    Abstract

    We present a simplified analytic formula that may be used to design gratings intended to couple long-wave infrared radiation to surface plasmons. It is based on the theory of Hessel and Oliner (1965). The recipe is semiempirical, in that it requires knowledge of a surface-impedance modulation amplitude, which is found here as a function of the grating groove depth and the wavelength for silver lamellar gratings at CO2 laser wavelengths. The optimum groove depth for photon-to-surface-plasmon energy conversion was found by experiment and calculation to be similar to 10%-15% of the wavelength. This value is about twice what has been reported previously in the visible spectral range for sinusoidal grating profiles. (c) 2010 Optical Society of America

    Journal Title

    Applied Optics

    Volume

    49

    Issue/Number

    16

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    3102

    Last Page

    3110

    WOS Identifier

    WOS:000278265600019

    ISSN

    1559-128X

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