Title

Analysis And Design Of Binary Gratings For Broadband Infrared Low Reflectivity Surfaces

Abstract

A design technique for multi-level binary optic structures that exhibit very low broadband reflectivity at oblique incidence is developed. The multi-level binary grating structures are equivalent to multi-layer thin film antireflection coating systems synthesized by the step-down inhomogeneous film technique. The design is shown to produce reflectivity of less than a few percentage points over a broadband optical spectra and over a wide range of the angles of incidence for unpolarized light. Designs for minimum reflection for unpolarized light are obtained for a two, three, and four-level binary system over a specified light wavelength range and angle of incidence. It is shown that three or four level systems are sufficient to produce very low reflectivity. It is also shown that the grating spacing does not have to be less than half the light wavelength to achieve this low broadband reflectivity.

Publication Date

9-1-1991

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

1485

Number of Pages

254-259

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.46540

Socpus ID

85076597200 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85076597200

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