Optical metasurfaces for beam scanning in space
Optical metasurfaces for beam scanning in space
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DOI：
10.1364/ol.39.002719
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发表时间：
2014-05-01
期刊：
影响因子：
3.6
通讯作者：
Mosallaei, Hossein
中科院分区：
文献类型：
--
作者：
Cheng, Jierong;Mosallaei, Hossein
探讨了由环形纳米天线构成的层状超表面用于空间波束扫描的概念。超表面的每一层都可以设想成一个可通过逐个单元修改回路配置来设计的分流阻抗片。由银制成的单环和同心环纳米天线分别提供电容和感应阻抗，在1.5 μ m时损耗可以忽略不计，可以完全控制波束相位和幅度。提出了一种用于三维空间波束扫描的电信超表面。复杂结构的建模采用了一种考虑单元间相互作用的时域有限差分方法，而不是许多设计采用假定局部周期性来模拟孤立单元。(C) 2014年美国光学学会
The concept of a layered metasurface constructed from loop nanoantennas for beam scanning in space is explored. Each layer of the metasurface can be envisioned as a shunt impedance sheet designable by modifying the loop configuration cell by cell. The single and concentric loop nanoantennas made of silver provide capacitive and inductive impedances, respectively, with negligible loss at 1.5 mu m, managing full control of the beam phase and amplitude. A telecom metasurface for beam scanning in 3D space is presented. The complex structure is modeled with an in-house-developed finite-difference time-domain method considering interactions among elements, in contrast to many designs in which isolated elements are simulated by assuming local periodicity. (C) 2014 Optical Society of America