Dielectric
optical nanoantennas are promising as fundamental building
blocks in next generation color displays, metasurface holograms, and
wavefront shaping optical devices. Due to the high refractive index
of the nanoantenna material, they support geometry-dependent Mie resonances
in the visible spectrum. Although phase change materials, such as
the germanium–antimony–tellurium alloys, and post-transition
metal oxides, such as ITO, have been used to tune antennas in the
near-infrared spectrum, reversibly tuning the response of dielectric
antennas in the visible spectrum remains challenging. In this paper,
we designed and experimentally demonstrated dielectric nanodisc arrays
exhibiting reversible tunability of Mie resonances in the visible
spectrum. We achieved tunability by exploiting phase transitions in
Sb2S3 nanodiscs. Mie resonances within the nanodisc
give rise to structural colors in the reflection mode. Crystallization
and laser-induced amorphization of these Sb2S3 resonators allow the colors to be switched back and forth. These
tunable Sb2S3 nanoantenna arrays could enable
the next generation of high-resolution color displays, holographic
displays, and miniature LiDAR systems.
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