Analysis and design of binary gratings for broadband, infrared, low-reflectivity surfaces

M. G. Moharam

doi:10.1117/12.46540

1 September 1991 Analysis and design of binary gratings for broadband, infrared, low-reflectivity surfaces

M. G. Moharam

Proceedings Volume 1485, Reflective and Refractive Optical Materials for Earth and Space Applications; (1991) https://doi.org/10.1117/12.46540
Event: Orlando '91, 1991, Orlando, FL, United States

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.

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M. G. Moharam "Analysis and design of binary gratings for broadband, infrared, low-reflectivity surfaces", Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); https://doi.org/10.1117/12.46540

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