Normally incident resonant grating reflection filters for efficient narrow-band spectral filtering of finite beams

    Authors

    D. K. Jacob; S. C. Dunn;M. G. Moharam

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. A-Opt. Image Sci. Vis.

    Keywords

    WAVE-GUIDE STRUCTURES; LINE-SHAPES; DESIGN; Optics

    Abstract

    Resonant grating reflection filters operating at normal incidence are investigated. At normal incidence these structures are shown to have characteristics different from those of structures operated at oblique incidence. We show how higher-order diffraction within the structure laterally confines the incident energy about the point of incidence and results in a broadened angular selectivity. Multimode structures are shown to exhibit broader angular selectivities and narrower spectral linewidths than those of single-mode structures, achieving angular selectivities hundreds of times broader than what could be obtained at oblique incidence. When compared with that for oblique incidence, the increase in angular selectivity is shown to greatly improve the performance of these filters for spectrally filtering finite incident beams. (C) 2001 Optical Society of America.

    Journal Title

    Journal of the Optical Society of America a-Optics Image Science and Vision

    Volume

    18

    Issue/Number

    9

    Publication Date

    1-1-2001

    Document Type

    Article

    Language

    English

    First Page

    2109

    Last Page

    2120

    WOS Identifier

    WOS:000170618300009

    ISSN

    0740-3232

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