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Large-scale, power-efficient Au/VO2 active metasurfaces for ultrafast optical modulation

Authors :
Shuang Xia
Zhigao Sheng
Tongtong Kang
Wei Yan
Lei Bi
Yucong Yang
Shilin Xian
Zheng Peng
Jian Shen
Taixing Huang
Chaoyang Li
Zongwei Ma
Jun Qin
Longjiang Deng
Weihao Yang
Source :
Nanophotonics, Vol 10, Iss 2, Pp 909-918 (2020)
Publication Year :
2020
Publisher :
De Gruyter, 2020.

Abstract

Active metasurfaces, in which the optical property of a metasurface device can be controlled by external stimuli, have attracted great research interest recently. For optical switching and modulation applications, high-performance active metasurfaces need to show high transparency, high power efficiency, as well as ultrafast switching and large-scale fabrication capability. This paper reports Au/VO2-based active metasurfaces meeting the requirements above. Centimeter-scale Au/VO2 metasurfaces are fabricated by polystyrene sphere colloidal crystal self-assembly. The devices show optical modulation on-off ratio up to 12.7 dB and insertion loss down to 3.3 dB at 2200 nm wavelength in the static heating experiment, and ΔT/T of 10% in ultrafast pump-probe experiments. In particular, by judiciously aligning the surface plasmon resonance wavelength to the pump wavelength of the femtosecond laser, the enhanced electric field at 800 nm is capable to switch off the extraordinary optical transmission effect at 2200 nm in 100 fs time scale. Compared to VO2 thin-film samples, the devices also show 50% power reduction for all-optical modulation. Our work provides a practical way to fabricate large-scale and power-efficient active metasurfaces for ultrafast optical modulation.

Details

Language :
English
ISSN :
21928614 and 21928606
Volume :
10
Issue :
2
Database :
OpenAIRE
Journal :
Nanophotonics
Accession number :
edsair.doi.dedup.....f1807e01700ec57ea1ac46d2d664f449