Title

Comparison Between Continuous And Discrete Subwavelength Grating Structures For Antireflection Surfaces

Keywords

Antireflective surfaces; Diffractive optics; Effective medium theory; Subwavelength gratings

Abstract

Both continuously tapered and discrete multilevel subwavelength grating structures are examined to determine the optimum method of designing antireflection surfaces. Continuously tapered gratings are designed with use of the optimal Klopfenstein graded index technique, while discrete multilevel stair-step gratings are designed with use of the Tschebyscheff quarter-wave synthesis technique. It is shown that a continuous design is always deeper than a discrete design. It is determined that since a subwavelength grating structure produces a bandpass surface, the high-pass (short-wave) performance of the continuous taper design cannot be realized. Therefore the discrete method of designing antireflection subwavelength gratings will always produce a shallower spatial profile or a smaller aspect ratio for any specified maximum reflection threshold level over a given passband. © 1996 Optical Society of America.

Publication Date

1-1-1996

Publication Title

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

Volume

13

Issue

5

Number of Pages

988-992

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/JOSAA.13.000988

Socpus ID

0000245066 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0000245066

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