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    Home > News > SEIEE Zhu Weiren's Team Published Research Results in ACS Photonics

    SEIEE Zhu Weiren's Team Published Research Results in ACS Photonics

    January 01, 2020      Author: Department of Electrical Engineering

     

    On Dec. 23rd, 2019, SJTU SEIEESchool of Electronic Information and Electrical EngineeringAssociate Professor Zhu Weiren's team published on the journal ACS Photonics a research paper "Electrically tunable metasurface with independent frequency and amplitude modulation". ACS Photonics is a top-level journal in the field of optoelectronics. It’s classified in the first division of Engineering Technology and Optics by the Chinese Academy of Sciences, and has an impact factor of 7.143. This work provides useful guidance for the application of graphene on metasurfaces, and also brings new degrees of freedom in designing metasurfaces.

     

    The first author is a doctoral student named Zhang Jin, and the corresponding author is Zhu Weiren. Collaborators include Wei Xingzhan, a researcher at the Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Ivan D. Rukhlenko at the University of Sydney, and Chen Houtong, Los Alamos National Laboratory, USA.

    This work is supported by the National Natural Science Foundation of China (61701303, 11574308) and the Shanghai Natural Science Foundation of China (17ZR1414300).

    Translated by Chen Qianqian Reviewed by Wang Bingyu

    Abstract

     

    Metasurfaces with actively tunable features are highly demanded for advanced applications in electronic and electromagnetic systems. However, realizing independent dual-tunability remains challenging and requires more efforts. In this paper, we present an active metasurface where the magnitude and frequency of the resonant absorption can be continuously and independently tuned through application of voltage biases. Such a dual-tunability is accomplished at microwave frequencies by combining a varactor-loaded high-impedance surface and a graphene-based sandwich structure. By electrically controlling the Fermi energy of graphene and the capacitance of varactor diodes, we experimentally desmonstrate the independent shifting of the working frequency from 3.41 to 4.55 GHz and tuning of the reflection amplitude between -3 and -30 dB, which is in excellent agreement with full-wave numerical simulations. We further employed an equivalent lumped circuit model to elucidate the mechanism of the dual-tunability resulting from the graphene-based sandwich structure and the active high-impedance surface. We speculate that such a dual-tunability scheme can be potentially extended to terahertz and optical regimes by employing different active/dynamical tuning methods and materials integration, thereby enabling a variety of practical applications.

     

     

     
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