Large-scale, power-efficient Au/VO2 active metasurfaces for ultrafast optical modulation
Author:
Kang Tongtong1, Ma Zongwei2, Qin Jun1ORCID, Peng Zheng1, Yang Weihao1, Huang Taixing13, Xian Shilin1, Xia Shuang1, Yan Wei1, Yang Yucong1, Sheng Zhigao2, Shen Jian45, Li Chaoyang45, Deng Longjiang1, Bi Lei1ORCID
Affiliation:
1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054 , China 2. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences , Hefei 230031 , China 3. Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology , Chengdu 610225 , China 4. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University , No. 58, Renmin Avenue , Haikou , Hainan Province 570228 , China 5. Dongguan ROE Technology Co., Ltd. , Dongguan , China
Abstract
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.
Funder
National Natural Science Foundation of China Sichuan Provincial Science and Technology Department Ministry of Science and Technology of the People’s Republic of China Dongguan Introduction Program of Leading Innovative and Entrepreneurial Talents
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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