Abstract
Fano resonance is based on plasmonic metasurfaces and has many applications in all kinds of fields. In this paper, we propose an independently switchable double-layer raster structure based on graphene. Depending on the highly adjustable nature of graphene, the Fermi energy level can be adjusted to control the Fano resonance at different wavelengths. The equivalent resonator coupling mode method is used to simulate the Fano resonance, and the transmission spectrum fits well. Functional switch at different wavelengths can be achieved using Fano resonance technology. The simulation obtained a fantastic group refractive index of the designed structure, indicating that there is a possibility to apply it in slow light. The effect of the environmental refractive index on sensing performance was studied and we found the structure has great potential in making high-sensitivity sensors. To sum up, it is hoped that this structure can make a great contribution to the manufacture of integrated optics.
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The data and material that support the findings of this study are available from the corresponding author upon reasonable request.
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The code that supports the findings of this study is available from the corresponding author upon reasonable request.
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Funding
This work was supported in part by the National Natural Science Foundation of China (11811530052), the Intergovernmental Science and Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China (CB02-20), the Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A04) and the Undergraduate Research and Innovation Projects of China (2021102Z).
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Z.W. and J.W. contributed to conceptualization and methodology; Z.W. and W.S. contributed to software; J.W. and Z.B. contributed to validation; Z.W, Z.D.H. and J.W. contributed to formal analysis; Z.W., J.W. and Z.H. contributed to writing—original draft preparation; J.S., S.K. and I.S. contributed to writing—review and editing; Z.W. contributed to visualization; J.W. contributed to supervision; J.W. and S.K. administrated the project; J.W. acquired funding. All authors have read and agreed to the published version of the manuscript.
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Wang, Z., Shi, W., Hu, Z. et al. Switchable Fano Resonance Filter with Graphene-based Double Freestanding Dielectric Gratings. Plasmonics 17, 1921–1927 (2022). https://doi.org/10.1007/s11468-022-01675-y
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DOI: https://doi.org/10.1007/s11468-022-01675-y