Abstract
Wavelength-tunable plasmon-induced transparency (PIT) in coupled graphene gratings was theoretically investigated in mid-infrared region. Both direct and phase-coupled PITs were considered in the proposed structure. In both schemes, a proper wavelength detuning between two graphene gratings was required for PIT observations. The effect of graphene quality on the PIT was also investigated. Graphene quality of μ = 50,000 cm2/Vs was sufficient for achieving a distinct PIT peak while a weak PIT was observed for μ = 10,000 cm2/Vs. PIT peak amplitude modulation and tunability of operating wavelength were demonstrated by adjusting the Fermi level of graphene. Compared with previously studied graphene-based PITs, the proposed PIT based on the coupled graphene gratings is much easier to design and fabricate.






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This work was supported by the National Research Foundation of Korea grants (NRF-2014-R1A2A2A01006720, NRF-2009-0094046, and NRF-2015M3C1A3022539).
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Kim, M., Lee, S. & Kim, S. Plasmon-Induced Transparency in Coupled Graphene Gratings. Plasmonics 10, 1557–1564 (2015). https://doi.org/10.1007/s11468-015-9965-7
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DOI: https://doi.org/10.1007/s11468-015-9965-7