Design of wideband graded-index antireflection coatings at oblique light incidence

doi:10.1088/1674-1056/21/1/014202

Abstract We suggest a design method of graded-refractive-index (GRIN) antireflection (AR) coating for s-polarized or p-polarized light at off-normal incidence. The spectrum characteristic of the designed antireflection coating with a quintic effective refractive-index profile for a given state of polarization has been discussed. In addition, the genetic algorithm was used to optimize the refractive index profile of the GRIN antireflection for reducing the mean reflectance of s- and p-polarizations. The average reflectance loss was reduced to only 0.04% by applying optimized GRIN AR coatings onto BK7 glass over the wavelength range from 400 to 800 nm at the incident angle of θ₀ =70°.

Keywords: oblique incidence graded-refractive-index profile antireflection coatings genetic algorithm

Received: 01 April 2011
Revised: 24 July 2011
Published: 20 January 2012

PACS:	42.25.Ja	(Polarization)
	42.79.Ry	(Gradient-index (GRIN) devices)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10704079 and 10976030).

Cite this article:

Zhang Jun-Chao, Fang Ming, Jin Yun-Xia, He Hong-Bo Design of wideband graded-index antireflection coatings at oblique light incidence 2012 Chin. Phys. B 21 014202

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