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Nonlinear Chiral Meta-Mirrors: Enabling Technology for Ultrafast Switching of Light Polarization.
- Source :
-
Nano letters [Nano Lett] 2020 Mar 11; Vol. 20 (3), pp. 2047-2055. Date of Electronic Publication: 2020 Feb 13. - Publication Year :
- 2020
-
Abstract
- Photonic nanostructures that realize ultrafast switching of light polarization are essential to advancements in the area of optical information processing. The unprecedented flexibility of metasurfaces in light manipulation makes them a promising candidate for active polarization control. However, due to the lack of optical materials exhibiting a fast as well as large refractive index change, photonic metadevices capable of ultrafast polarization switching remain elusive. Here, an ultrathin nonlinear chiral meta-mirror consisting of an array of amorphous silicon (α-Si) split-ring resonators on top of a silver backplane is demonstrated as a feasible platform for picosecond all-optical polarization switching of near-infrared light at picojoule-per-resonator pump energies. This success was made possible by the high-quality-factor resonances of the proposed meta-atoms that enable the mirror to exhibit strong chiro- and enantioselectivity. Experimental results confirm that our meta-mirrors can be used to facilitate high-speed and power-efficient polarization-state modulators.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 20
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 32031817
- Full Text :
- https://doi.org/10.1021/acs.nanolett.0c00007