Lalanne P, Astilean S, Chavel P, Cambril E, Launois H
Opt Lett. 1998 Jul 15;23(14):1081-3. doi: 10.1364/ol.23.001081.
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 3lambda-period blazed binary grating composed of square pillars is designed for He-Ne operation and is fabricated by etching of a TiO>(2) layer deposited upon a glass substrate. Its first-order measured diffraction efficiency is 12% larger than the theoretical efficiency of an ideal blazed échelette grating in glass with the same period.
我们引入了一个新的结构截止值，超过该值亚波长光栅将不再表现为均匀介质，并讨论了其对亚波长衍射元件采样周期正确选择的影响。根据该分析，设计了一种由方柱组成的用于氦氖激光器工作的3λ周期闪耀二元光栅，并通过蚀刻沉积在玻璃基板上的TiO₂层来制造。其测量的一阶衍射效率比具有相同周期的玻璃中理想闪耀阶梯光栅的理论效率大12%。
