Shuang Wang, Xiaoli Zhao, Song Wang, Jianyu Zhu, Quan Li, and Yaxin Wang
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| Fig. 2. (a) Experimental, (b)Simulated amplitude transmission spectra for samples, surface current, and (c) Magnetic field distribution (on the XZ plane at Y = 0) at ω2resonances of the design with different values of θ, (d) and (e) Schematics of the formation of head-to-tail arrangement correlating at ω1 and ω2, respectively. |
https://www.osapublishing.org/ome/abstract.cfm?uri=ome-9-9-3657
We designed and fabricated terahertz toroidal dipole metasurfaces based on a C-shaped split ring resonator metallic pattern fabricated on a flexible dielectric material (mylar). The toroidal dipole moment (Ty) was demonstrated as the dominant contribution to two different resonances at low frequency (ω1) and at high frequency (ω2). Simulation and LC circuit model analysis offered a quantitative explanation to the blue shift of the resonant frequencies at ω1and ω2 as the increase of the opening angle(θ). The resonant frequencies showed a red shift at ω1 and ω2 as the increase of the outer ring radius (QR). Furthermore, the enhancement of the Q factor was attributed to the increase of Ty and the decrease of radiative loss. It was further proven that the model provided a new scheme for designing the toroidal dipole metasurfaces under a terahertz band, which was expected to be used as terahertz functional devices.
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