Phase-change metasurfaces for dyamic beam steering and beam shaping in the infrared
Ruiz De Galarreta Fanjul, C; Alexeev, A; Bertolotti, J; et al.Wright, CD
Date: 23 February 2018
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Publisher DOI
Abstract
We present novel phase-change material based
metasurfaces for dynamic, recnofigurable and efficient wavefront
shaping in the infrared spectrum. Dynamic control and
reconfigurability was obtained by incorporating an ultra-thin layer
of the widely-used phase change material Ge2Sb2Te5. Our approach
exploits hybrid dielectic/plasmonic ...
We present novel phase-change material based
metasurfaces for dynamic, recnofigurable and efficient wavefront
shaping in the infrared spectrum. Dynamic control and
reconfigurability was obtained by incorporating an ultra-thin layer
of the widely-used phase change material Ge2Sb2Te5. Our approach
exploits hybrid dielectic/plasmonic resonances to achieve local
(subwavelength) phase control of light with low losses. A full 2π
optical phase coverage was achieved with this approach, which
allows for a wide flexibility in terms of realizable designs. To
illustrate this concept, dynamic beam steering devices and
reconfigurable planar focusing mirrors (both operating at optical
telecommunications wavelengths) and their performance
investigated. Absolute efficiencies up to 65% are achieved,
significantly higher than the efficiencies of more commonly reported
plasmonic-based phase-change metasurfaces.
Engineering
Faculty of Environment, Science and Economy
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