Abstract
We present cut-induced asymmetric split-ring resonator (CASRR) structure that can achieve switchable Fano resonance based on Dirac semimetals at the terahertz region. By changing the asymmetric geometric parameter from 3 to 13 µm, the transmission spectrum can be switched from single to dual channel and the Fano resonance can be gradually enhanced, which is consistent with the two coupled oscillators model. Meanwhile, the Fano effect can also be effectively switched by adjusting the Fermi energy of Dirac semimetal film (DSF) and it is suitable for practical applications. In the view of sensing application, the sensitivity based on Fano resonance is up to 69.75 GHz/RIU and 134.25 GHz/RIU with the thickness of sample 1 μm and 20 μm, respectively. Such manipulation of Fano resonance by using DSF may have potential applications in terahertz switch, sensor, and multichannel communication.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This project was supported by the National Key R&D Program of China (2018YFF01013003), the National Natural Science Foundation of China (Nos. 61671302, 61988102), the Shuguang Program Supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission, China (No. 18SG44), the 111 Project (D18014), and the International Joint Lab Program supported by Science and Technology Commission Shanghai Municipality (17590750300).
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All authors contributed to the study. Simulation was performed by Dehua Tu and Yiping Wu. Methodology and formal analysis were performed by Jingya Xie. Supervision and validation were performed by Xiaofei Zang. Data verification and writing—review and editing were performed by Li Ding. Conceptualization, writing—original draft, review, and editing were performed by Lin Chen. All authors read and approved the final manuscript.
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Tu, D., Wu, Y., Xie, J. et al. Switchable Fano Resonance Based on Cut-Induced Asymmetric Split-Ring Resonators with Dirac Semimetal Film. Plasmonics 16, 1405–1415 (2021). https://doi.org/10.1007/s11468-021-01417-6
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DOI: https://doi.org/10.1007/s11468-021-01417-6