Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 42, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/s10762-020-00756-5
Keywords
Terahertz; Electromagnetically induced transparency; Metamaterials; Toroidal dipole
Funding
- National Natural Science Foundation of China [61505146, 61705167]
- Science Development Foundation of Tianjin University of Technology and Education [KJ1920, RC14-52]
- Start-up project of scientific research of Tianjin University of Technology and Education [KYQD1718, KYQD1907]
- Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology
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The study introduces and fabricates J-shaped planar structure metasurfaces to achieve dual-frequency toroidal dipole resonances and electromagnetically induced transparency effect in the terahertz band. By coupling two asymmetric J-shaped metal rings, low-frequency and high-frequency toroidal dipole resonances are simultaneously excited, creating a transparent window. The resonant response of the toroidal dipole can be adjusted by structural parameters, showing sensing characteristics of the metasurfaces, providing potential for the development of terahertz functional devices.
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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