ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Wide-angle and broadband graded-refractive-index antireflection coatings |
Zhang Jun-Chao (张俊超)a b, Xiong Li-Min (熊利民)a, Fang Ming (方明)b, He Hong-Bo (贺洪波)b |
a Optic and Laser Division, National Institute of Metrology, Beijing 100013, China; b Key Laboratory of Material Science and Technology for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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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.
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Received: 21 July 2012
Revised: 09 September 2012
Accepted manuscript online:
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PACS:
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42.25.Gy
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(Edge and boundary effects; reflection and refraction)
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42.79.Ry
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(Gradient-index (GRIN) devices)
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42.79.Wc
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(Optical coatings)
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Corresponding Authors:
Zhang Jun-Chao
E-mail: zhangjunchao4568@163.com
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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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