Nonvolatile Reconfigurable Phase‐Change Metadevices for Beam Steering in the Near Infrared
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 05, 2018
- Source ID
- 10.1002/adfm.201704993
Entities
People
- Arseny M. Alexeev
- C D Wright
- Carlota Ruiz De Galarreta
- Jacopo Bertolotti
- Maciej Klemm
- Martin Cryan
- Martin Lopez‐garcia
- Yat‐yin Au
Organizations
- Engineering and Physical Sciences Research Council
- United States Naval Research Laboratory
- University of Bristol
- University of Exeter