Wide-angle and broadband graded-refractive-index antireflection coatings

doi:10.1088/1674-1056/22/4/044201

Abstract Design and fabrication of graded-refractive-index (GRIN) antireflection (AR) coatings with wide-angle and broadband characteristics are demonstrated. The optimization of the graded-index profiles with a genetic algorithm is used in the design of GRIN AR coatings. The average reflectance over the wavelength range from 400 nm to 800 nm and angles of incidence from 0° to 80° could be reduced to only 0.1% by applying an optimized AR coating onto BK7 glass. The optimization of step-graded GRIN AR coating is further investigated in detail. A two-layer AR coating was deposited by electron beam evaporation with glancing angle deposition technology. The positional homogeneity was improved by depositing the film from two opposite directions. The microstructure of the AR coating was investigated by scanning electron microscopy. Residual reflectances of the coating sample are in agreement with theoretical calculations. The optimized GRIN AR coatings are beneficial to increase the efficiency of light utilization.

Keywords: antireflection wide-angle broadband refractive-index profile

Received: 21 July 2012
Revised: 09 September 2012
Accepted manuscript online:

PACS:	42.25.Gy	(Edge and boundary effects; reflection and refraction)
	42.79.Ry	(Gradient-index (GRIN) devices)
	42.79.Wc	(Optical coatings)

Corresponding Authors: Zhang Jun-Chao
E-mail: zhangjunchao4568@163.com

Cite this article:

Zhang Jun-Chao (张俊超), Xiong Li-Min (熊利民), Fang Ming (方明), He Hong-Bo (贺洪波) Wide-angle and broadband graded-refractive-index antireflection coatings 2013 Chin. Phys. B 22 044201

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