期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201704993
关键词
beam steering; phase-change materials; phased arrays; photonic metadevices; plasmonic metasurfaces; reflectarrays
类别
资金
- EPSRC CDT in Metamaterials [EP/L015331/1]
- EPSRC [EP/M0090331]
- EPSRC ChAMP
- US Naval Research LaboratoriesONRG programme [N6290916-1-2174]
- WAFT [EP/M015130/1, EP/M015173/1]
- EPSRC [EP/I017852/1, EP/M009033/1, EP/M015130/1, EP/M015173/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M015173/1, 1660248, EP/M015130/1, EP/I017852/1, EP/M009033/1] Funding Source: researchfish
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.
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