Blazed binary subwavelength gratings with efficiencies larger than those of conventional echelette gratings
Blazed binary subwavelength gratings with efficiencies larger than those of conventional echelette gratings
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DOI：
10.1364/ol.23.001081
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发表时间：
1998-07-15
期刊：
影响因子：
3.6
通讯作者：
Launois, H
中科院分区：
文献类型：
--
作者：
Lalanne, P;Astilean, S;Launois, H
我们引入了一种新的结构截止，超过该截止，亚波长光栅不再表现为均匀介质，并讨论了它对适当选择亚波长衍射元件的采样周期的影响。在此基础上，设计了一种适用于He-Ne激光器的3 λ周期方形柱闪耀二元光栅，并通过刻蚀沉积在玻璃衬底上的TiO_2层制作了光栅。它的一阶衍射效率比相同周期的理想闪耀小阶梯光栅的理论衍射效率高12%。(C)1998年美国光学学会。
We introduce a new structural cutoff beyond which subwavelength gratings cease to behave as homogeneous media and discuss its effects on the proper selection of the sampling periods of subwavelength diffractive elements. According to this analysis, a 3 lambda-period blazed binary grating composed of square pillars is designed for He-Ne operation and is fabricated by etching of a TiO2 layer deposited upon a glass substrate. Its first-order measured diffraction efficiency is 12% larger than the theoretical efficiency of an ideal blazed echelette grating in glass with the same period. (C) 1998 Optical Society of America.