Abstract
Toroidal resonance of planar structure is feasible and interesting for many appealing applications. We numerically and experimentally investigated the toroidal resonances in a planar metamaterial comprising core-shell structures and its constituent core and shell components at THz frequencies. The investigated structure demonstrated sharp toroidal and hybrid toroidal resonance modes in 0.2–0.3 THz range. Our analysis showed that these modes could be explained by the interaction of resonance toroidal modes of the shell and core components. The response of the investigated planar core-shell toroidal metasurface is notably geometry dependent and can be easily tuned by tailoring the device geometry. Presented work can be used for advanced THz photonics applications, including precise bio-sensing, narrow-band filters, fast-switching, and modulation.
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All datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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This work was partially supported by the Army Research Laboratory Multiscale Multidisciplinary Modeling of Electronic Materials Collaborative Research Alliance under Grant W911NF-12-2-0023.
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Naznin Akter was responsible for writing the manuscript, simulation data acquisition, and data analysis. Adam Legacy and Fahmida Alam contributed to the overall experimental and simulated data acquisition process. Nezih Pala was responsible for the overall planning of the study, final manuscript proofreading, and correcting. All authors read and approved the final manuscript.
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Akter, N., Legacy, A., Alam, F. et al. Hybrid Toroidal Resonance Response in Planar Core-Shell THz Metasurfaces. Plasmonics 16, 1657–1663 (2021). https://doi.org/10.1007/s11468-021-01427-4
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DOI: https://doi.org/10.1007/s11468-021-01427-4