Abstract
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.
Original language | English |
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Pages (from-to) | 19722-19732 |
Number of pages | 11 |
Journal | ACS Nano |
Volume | 15 |
Issue number | 12 |
Early online date | 9 Dec 2021 |
DOIs | |
Publication status | Published - 28 Dec 2021 |
Bibliographical note
Funding Information:This work is supported by the funding support of A*STAR AME IRG project with a project number of A20E5c0093. In addition, R.E.S., Y.W., and L.L. acknowledge funding support from the Nano Spatial Light Modulators (NSLM) AME grant (A18A7b0058). Z.D. also would like to acknowledge the funding support from the A*STAR career development award (CDA) with the grant number of 202D8088. J.K.W.Y. would like to acknowledge the funding from National Research Foundation (NRF) Singapore with the grant numbers of NRF-CRP20-2017-0001 and NRF-NRFI06-2020-0005.
Publisher Copyright:
© 2021 American Chemical Society.
Keywords
- dielectric nanoantenna
- Mie resonance
- phase change materials
- structural color
- tunable nanophotonics
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy