Subwavelength gratings optimized for broadband quarter-wave plates

Hisao Kikuta; Yasushi Ohira; Koichi Iwata

doi:10.1117/12.246224

16 August 1996 Subwavelength gratings optimized for broadband quarter-wave plates

Hisao Kikuta, Yasushi Ohira, Koichi Iwata

Proceedings Volume 2873, International Symposium on Polarization Analysis and Applications to Device Technology; (1996) https://doi.org/10.1117/12.246224
Event: International Symposium on Polarization Analysis and Applications to Device Technology, 1996, Yokohama, Japan

Abstract

A broadband quarter-wave plate of subwavelength lamellar grating has been designed by an optimizing method using the effective medium theory and the rigorous couple wave analysis. The phase retardation can be maintained at 90 degree(s) by strong dispersion of the propagation constant in the periodic structure. Before optimizing the grating profile by the rigorous analysis, the profile is roughly estimated with the effective medium theory. After the rough estimation, the close profile is determined by the steepest descent method using the rigorous analysis. The optimized quarter wave plate keeps the retardation at 90 degree(s) with errors smaller than 1 degree(s) for the +/- 10% change in wavelength from the nominal wavelength. Also tolerances of fabrication errors are discussed.

Citation Download Citation

Hisao Kikuta, Yasushi Ohira, and Koichi Iwata "Subwavelength gratings optimized for broadband quarter-wave plates", Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); https://doi.org/10.1117/12.246224

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