Dynamic Beam Switching by Liquid Crystal Tunable Dielectric Metasurfaces
Dynamic Beam Switching by Liquid Crystal Tunable Dielectric Metasurfaces
复制标题
DOI：
10.1021/acsphotonics.7b01343
复制
发表时间：
2018-05-01
期刊：
影响因子：
7
通讯作者：
Neshev, Dragomir
中科院分区：
文献类型：
--
作者：
Komar, Andrei;Paniagua-Dominguez, Ramon;Neshev, Dragomir
利用光学超颖表面实现激光束的动态转向是一项重要的研究进展，有望在遥感领域得到应用。具有最高传输效率的电介质超颖表面为这些重要功能提供了独特的平台。然而，实现动态可调的元表面仍然是一个挑战。在这里，我们实验证明了动态切换的光束偏转硅纳米盘介质超颖表面渗透液晶。特别地，我们示出了通过加热超颖表面以将液晶状态从双折射修改为各向同性，以50%的效率将激光束从0度角切换到12度角。我们的研究结果为可调双光束操纵元器件提供了重要的机会。
Dynamic steering of laser beams by ultrathin optical metasurfaces is a significant research advance for possible applications in remote ranging and sensing. A unique platform for such important functionalities is offered by dielectric metasurfaces that have the highest transmission efficiency. However, the realization of dynamically tunable metasurfaces still remains a challenge. Here we experimentally demonstrate the dynamic switching of beam deflection by a silicon-nanodisk dielectric metasurface infiltrated with liquid crystals. In particular, we show the switching of a laser beam from 0 degrees to a 12 degrees angle with an efficiency of 50% by heating the metasurface to modify the liquid crystal state from nematic to isotropic. Our results open important opportunities for tunable ultrathin beam steering metadevices.