期刊
NANO LETTERS
卷 20, 期 3, 页码 2047-2055出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00007
关键词
metasurfaces; chirality; nonlinearity; optical switching; polarization
类别
资金
- Penn State MRSEC, Center for Nanoscale Science (NSF) [DMR-1420620]
- DARPA EXTREME program [HR00111720032]
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 metamirror consisting of an array of amorphous silicon (alpha-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.
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