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Applied Optics

Applied Optics


  • Vol. 27, Iss. 17 — Sep. 1, 1988
  • pp: 3738–3743

Antireflection gold surface-relief gratings: experimental characteristics

Nile F. Hartman and Thomas K. Gaylord  »View Author Affiliations

Applied Optics, Vol. 27, Issue 17, pp. 3738-3743 (1988)

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A systematic procedure using the effective index method and impedance matching has recently been developed Appl. Opt. 26, 3123 ( 1987)] for the design of antireflection high-spatial-frequency rectangular-groove gratings on lossy materials including high conductivity metals. The design procedure in turn can be used as a starting point to design antireflection metallic gratings with lower spatial frequencies using rigorous coupled-wave analysis. These lower spatial-frequency gratings have the advantage of being easier to fabricate. In the present work, a particular antireflection gold grating design (having a period of 1.0 μm, a filling factor of 50%, and a groove depth of 147.5 nm for use at a freespace wavelength of 500 nm, normal incidence, and polarization parallel to the grooves) was fabricated and its diffraction characteristics experimentally measured. The grating indeed showed very nearly zero specular reflection in the blue region of the spectrum. Unlike previously reported antireflection anomalies, the effect is broadband occurring over a broad range of wavelengths and angles of incidence, and for both orthogonal polarizations. This work clearly shows that the systematic design of zero specular reflection grating surfaces is possible.

© 1988 Optical Society of America

Original Manuscript: February 10, 1988
Published: September 1, 1988

Nile F. Hartman and Thomas K. Gaylord, "Antireflection gold surface-relief gratings: experimental characteristics," Appl. Opt. 27, 3738-3743 (1988)

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