Title

Artificial Uniaxial And Biaxial Dielectrics With Use Of Two-Dimensional Subwavelength Binary Gratings

Keywords

Antireflection; Artificial medium; Binary gratings; Diffractive optics

Abstract

Two-dimensional symmetric and asymmetric subwavelength, binary gratings are investigated. A method for determining the three effective indices of a two-dimensional (2-D) subwavelength grating is presented, as well as a theoretical formalization for the effective index parallel with the normal to the surface. It is shown that a 2-D asymmetric binary grating on the surface of a dielectric substrate is analogous to a biaxial thin film. If the grating is symmetric, then the two effective indices perpendicular to the normal are equal, and the grating is analogous to a uniaxial thin film. Using these effective indices and the quarter-wave Tschebyscheff synthesis technique, we designed two- and three-level binary gratings to suppress reflections over a broad band. It is shown that for a substrate index of ns = 3.0 a three-level 2-D binary grating reduced reflections below 0.1% from 8μm to 12μm. © 1994 Optical Society of America.

Publication Date

1-1-1994

Publication Title

Journal of the Optical Society of America A: Optics and Image Science, and Vision

Volume

11

Issue

10

Number of Pages

2695-2703

Document Type

Article

Identifier

scopus

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/JOSAA.11.002695

Socpus ID

0028531768 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0028531768

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