Large-scale, power-efficient Au/VO 2 active metasurfaces for ultrafast optical modulation

Nanophotonics

article

Tongtong Kang¹  Wei Yan¹  Yucong Yang¹  Zhigao Sheng²  Jian Shen³  Chaoyang Li³  Longjiang Deng¹  Lei Bi¹  Zongwei Ma²  Jun Qin¹  Zheng Peng¹  Weihao Yang¹  Taixing Huang¹  Shilin Xian¹  Shuang Xia¹ 

[1] National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China;Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences;State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University;Ltd.;Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology

关键词: all-optical modulation;    metasurface;    phase change materials;    surface plasmon resonance;    VO2;   

DOI  :  10.1515/nanoph-2020-0354

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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/VO 2 -based active metasurfaces meeting the requirements above. Centimeter-scale Au/VO 2 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 Δ T / 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 VO 2 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.

【 授权许可】

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