Nonvolatile Reconfigurable Phase-Change Metadevices for Beam Steering in the Near Infrared
Nonvolatile Reconfigurable Phase-Change Metadevices for Beam Steering in the Near Infrared
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DOI：
10.1002/adfm.201704993
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发表时间：
2018-03-07
影响因子：
19
通讯作者：
Wright, C. David
中科院分区：
文献类型：
--
作者：
de Galarreta, Carlota Ruiz;Alexeev, Arseny M.;Wright, C. David
没有笨重移动部件的扁平、紧凑的光束转向设备的开发为各种令人兴奋的应用开辟了新的途径，例如用于自动驾驶汽车、机器人和传感、自由空间甚至表面波光信号耦合的激光雷达扫描系统。在本文中，创新的，非易失性的，和可重构的光束转向元器件的设计，制造和表征的光学超颖表面和硫属化物相变材料的组合启用的报告。当相变层处于结晶状态时，元器件以类似镜面的方式反射入射光束，但是当相变层切换到其非晶状态时，元器件以预先设计的角度反射。实验角度分辨光谱测量验证，制造的设备执行设计，具有高效率，高达40%，当在1550 nm的操作。激光诱导结晶和再非晶化实验证实了器件的可逆开关。据信，可重构的基于相变的光束转向和光束整形元器件，如这里报道的那些，可以提供真实的应用优势，如高效率、紧凑性、快速切换时间，以及由于硫属化物相变材料的非易失性，低功耗。
The development of flat, compact beam-steering devices with no bulky moving parts is opening up a new route to a variety of exciting applications, such as LIDAR scanning systems for autonomous vehicles, robotics and sensing, free-space, and even surface wave optical signal coupling. In this paper, the design, fabrication and characterization of innovative, nonvolatile, and reconfigurable beam-steering metadevices enabled by a combination of optical metasurfaces and chalcogenide phase-change materials is reported. The metadevices reflect an incident optical beam in a mirror-like fashion when the phase-change layer is in the crystalline state, but reflect anomalously at predesigned angles when the phase-change layer is switched into its amorphous state. Experimental angle-resolved spectrometry measurements verify that fabricated devices perform as designed, with high efficiencies, up to 40%, when operating at 1550 nm. Laser-induced crystallization and reamorphization experiments confirm reversible switching of the device. It is believed that reconfigurable phase-change-based beam-steering and beam-shaping metadevices, such as those reported here, can offer real applications advantages, such as high efficiency, compactness, fast switching times and, due to the nonvolatile nature of chalcogenide phase-change materials, low power consumption.