OPTIMAL-DESIGN FOR ANTIREFLECTIVE TAPERED 2-DIMENSIONAL SUBWAVELENGTH GRATING STRUCTURES

被引:218
作者
GRANN, EB
MOHARAM, MG
POMMET, DA
机构
[1] Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, FL
来源
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION | 1995年 / 12卷 / 02期
关键词
DIFFRACTIVE OPTICS; SUBWAVELENGTH GRATINGS; EFFECTIVE-MEDIUM THEORY; GRADIENT INDEX; ANTIREFLECTION;
D O I
10.1364/JOSAA.12.000333
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Techniques for the design of continuously tapered two-dimensional (2D) subwavelength surface-relief grating structures for broadband antireflection surfaces are investigated. It has been determined that the Klopfenstein taper [Proc. IRE 44, 31 (1956)] produces the optimum graded-index profile with the smallest depth for any specified minimum reflectance. A technique is developed to design the equivalent tapered subwavelength surface-relief grating structure by use of 2D effective-medium theory. An optimal Klopfenstein tapered 2D subwavelength grating is designed to reduce the Fresnel reflections by 20 dB over a broad band from an air-substrate (n(s) = 3.0) interface. The performance is verified by use of both a 2D effective-medium-theory simulation algorithm and rigorous coupled-wave analysis. These structures are also shown to achieve this low reflectance over a wide field of view (theta(FOV) > 110 degrees). The pyramidal spatial profile, which has generally been assumed to produce the optimal broadband antireflection grating structure, is shown to require a significantly larger depth to achieve the same performance as a Klopfenstein-designed tapered antireflection grating structure.
引用
收藏
页码:333 / 339
页数:7
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