Efficiency optimization of blazed effective-medium gratings in the resonance domain

被引：2
|
作者：
Hyvarinen, Heikki J. [1 ]
Turunen, Jari [1 ]
Saarikko, Pasi [2 ]
机构：
[1] Univ Joensuu, Dept Math & Phys, FI-80101 Joensuu, Finland
[2] Nokia Res Ctr, Media Lab, FI-00180 Helsinki, Finland
来源：
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2008年 / 10卷 / 05期
关键词：
diffraction; gratings; binary optics; effective media;
D O I：
10.1088/1464-4258/10/5/055005
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Three types of subwavelength-structured grating for efficient beam deflection in the non-paraxial domain are considered. The first-order efficiency is optimized by first designing an index-modulated grating and then encoding the optimized values of refractive index in the form of surface-relief profiles using effective-medium theory. Comparison with direct parametric optimization shows the feasibility of the approach in finding nearly optimum designs with greatly reduced computational effort.
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页数：7
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