Abstract
We proposed and fabricated J-shaped planar structure metasurfaces to achieve excitation of dual-frequency toroidal dipole resonances simultaneously, which results in electromagnetically induced transparency effect in the terahertz band. The mutual coupling of two asymmetric J-shaped metal rings in the metasurface units excites low-frequency and high-frequency toroidal dipole resonances, and a transparent window was formed. The fitted curves based on the Fano resonance model have a good consistency with the simulated transmission spectrum of the metasurfaces, which explains this coupling effect deeply. The resonant mode and radiant mechanism were revealed by the analysis of the electromagnetic field distribution and the numerical calculation of the multipole moment. Furthermore, the toroidal dipole resonant response can be adjusted by the structural parameter, indicating the sensing characteristics of the metasurfaces. The simple and flexible planar toroidal dipole metasurfaces with electromagnetically induced transparency effect provide more possibilities for the development and application of terahertz functional devices.
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Funding
This research was supported by the National Natural Science Foundation of China (Grant numbers 61505146 and 61705167), and the Science Development Foundation of Tianjin University of Technology and Education (Grant number KJ1920, RC14-52), and the Start-up project of scientific research of Tianjin University of Technology and Education (Grant number KYQD1718 and KYQD1907). We also thank for the support from Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Song Wang, Shuang Wang, Quan Li, and Tai Chen. The collation of relevant literature is completed by Xiaoli Zhao and Jianyu Zhu. The first draft of the manuscript was written by Song Wang and Shuang Wang. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, S., Wang, S., Zhao, X. et al. Excitation of Electromagnetically Induced Transparency Effect in Asymmetrical Planar Terahertz Toroidal Dipole Metasurfaces. J Infrared Milli Terahz Waves 42, 40–49 (2021). https://doi.org/10.1007/s10762-020-00756-5
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DOI: https://doi.org/10.1007/s10762-020-00756-5