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

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 polarizati...

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Published inChinese physics B Vol. 21; no. 1; pp. 199 - 203
Main Author 张俊超 方明 晋云霞 贺洪波
Format Journal Article
LanguageEnglish
Published 2012
Subjects
Antireflection coatings
Coating
GRIN
Incidence
Reflectance
Reflectivity
Refractive index
Refractivity
Wavelengths
Wideband
偏振状态
宽带增透膜
抗反射涂层
折射率剖面
斜入射光
梯度折射率
设计方法
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/1/014202

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Summary: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 θo = 70°.
Bibliography: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 θo = 70°.
antireflection coatings, oblique incidence, graded-refractive-index profile, genetic algo-rithm
11-5639/O4
Zhang Jun-Chao, Fang Ming, Jin Yun-Xia, and He Hong-Bo（a） 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 b） Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/1/014202