Abstract
We present a design of tunable terahertz (THz) metamaterial (TTM) with single-band and dual-band filtering and switching characteristics. The proposed device is composed of face-to-face split-ring resonator (SRR) and a central bar. By moving the SRRs to change the gap between SRRs and central bar, the free spectrum ranges (FSR) could be bi-directionally broadened 0.14 THz and narrowed 0.19 THz at TE and TM modes, respectively. To control the coplanar moving central bar, the electromagnetic response of TTM device exhibits polarization-dependent characteristic. TTM shows the switching characteristic between single-band to dual-band resonance at TE mode and exhibits resonance-insensitive to the displacement of central bar at TM mode. These results open an avenue to be potentially used for detector, sensor, and switch in the THz-wave applications.
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Acknowledgement
The authors acknowledge the financial support from research grants of 100 Talents Program of Sun Yat-Sen University (Grant number 76120-18841202) and the State Key Laboratory of Optoelectronic Materials and Technologies of Sun Yat-Sen University for the use of FDTD simulation code (LUMERICAL version: 8.12.631).
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Hu, X., Zheng, D. & Lin, YS. Actively tunable terahertz metamaterial with single-band and dual-band switching characteristic. Appl. Phys. A 126, 110 (2020). https://doi.org/10.1007/s00339-019-3274-5
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DOI: https://doi.org/10.1007/s00339-019-3274-5