Comparison Between Continuous And Discrete Subwavelength Grating Structures For Antireflection Surfaces

    Authors

    E. B. Grann;M. G. Moharam

    Comments

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    Abbreviated Journal Title

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

    Keywords

    diffractive optics; subwavelength gratings; effective medium theory; antireflective surfaces; RELIEF GRATINGS; Optics

    Abstract

    Both continuously tapered and discrete multilevel subwavelength grating structures are examined to determine the optimum method of designing antireflection surfaces. Continuously tapered gratings are designed with use of the optimal Klopfenstein graded index technique, while discrete multilevel stair-step gratings are designed with use of the Tschebyscheff quarter-wave synthesis technique. It is shown that a continuous design is always deeper than a discrete design. It is determined that since a subwavelength grating structure produces a bandpass surface, the high-pass (short-wave) performance of the continuous taper design cannot be realized. Therefore the discrete method of designing antireflection subwavelength gratings will always produce a shallower spatial profile or a smaller aspect ratio for any specified maximum reflection threshold level over a given passband. (C) 1996 Optical Society of America

    Journal Title

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

    Volume

    13

    Issue/Number

    5

    Publication Date

    1-1-1996

    Document Type

    Article

    Language

    English

    First Page

    988

    Last Page

    992

    WOS Identifier

    WOS:A1996UG50600011

    ISSN

    0740-3232

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