[OPTICAL REVIEW Vol. 16, No. 2 (2009) 176-179]
© 2009 The Optical Society of Japan

Spiral Search Method for Designing a Wide Angular Broadband Visible Antireflection Coating

Yeuh-Yeong LIOU*, Zhi-Wei WEI, Li-Rang WANG, Chi-Chang LIU1, Chin-Chiuan KUO1, Cheng-Chung JAING2, and Cheng-Chung LEE3

Department of Electronic Engineering, Chienkuo Technology University, No. 1, Jieh Shou N. Rd., Chang-Hua 500, Taiwan, R.O.C.
1Mechanical Engineering and Graduate Institute Manufacturing Technology, Chienkuo Technology of University, No. 1, Jieh Shou N. Rd., Chang-Hua 500, Taiwan, R.O.C.
2Department of Optoelectronic System Engineering, Minghsin University of Science and Technology, No. 1, Hsin-Hsing Rd., Hsin-Fong, Hsin-Chu 304, Taiwan, R.O.C.
3Department of Optics and Photonics, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 320, Taiwan, R.O.C.

(Received July 10, 2008; Accepted December 5, 2008)

A spiraling search method is applied to design a wide angular visible antireflection (AR) coating with an incident angle of up to 50° above normal. Only a two-material multilayer system with high- and low-index is used in the design. It is shown that the maximum visible reflectivity can be reduced to below 1.26%, and that the total average wide-angle visible spectral reflectivity can be reduced to lower than 0.33%, respectively. Not only is the wide-angle visible AR performance in the designed range very acceptable, but it is found that the visible reflectivity for that incident angle beyond 50° can also be decreased.

Key words: antireflection coating, wide angular, broadband, spiraling search, design algorithm

*E-mail address: yyliou@ctu.edu.tw

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