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Chin. Phys. B, 2012, Vol. 21(1): 014202    DOI: 10.1088/1674-1056/21/1/014202
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

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

Zhang Jun-Chao(张俊超)a)b), Fang Ming(方明)a), Jin Yun-Xia(晋云霞)a), and He Hong-Bo(贺洪波)a)
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
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:  antireflection coatings      oblique incidence      graded-refractive-index profile      genetic algorithm  
Received:  01 April 2011      Revised:  24 July 2011      Accepted manuscript online: 
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(张俊超), Fang Ming(方明), Jin Yun-Xia(晋云霞), and He Hong-Bo(贺洪波) Design of wideband graded-index antireflection coatings at oblique light incidence 2012 Chin. Phys. B 21 014202

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