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9 March 2020 Tunable graphene-based hyperbolic metamaterials: experimental demonstration and outlook (Conference Presentation)
Georgia Theano Papadakis, Harry A. Atwater Jr., Artur Davoyan
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Proceedings Volume 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII; 112840U (2020) https://doi.org/10.1117/12.2545064
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Tuning the macroscopic dielectric response on demand holds potential for actively tunable metaphotonics and optical devices. In recent years, graphene has been extensively investigated as a tunable element in nanophotonics. Significant theoretical work has been devoted on the tuning the hyperbolic properties of graphene/dielectric heterostructures, however, until now, such a motif has not been demonstrated experimentally. Here we focus on a graphene/polaritonic dielectric metamaterial, with strong optical resonances arising from the polar response of the dielectric, which are, in general, difficult to actively control. By controlling the doping level of graphene via external bias we experimentally demonstrate a wide range of tunability from a Fermi level of EF = 0 eV to EF = 0.5 eV, which yields an effective epsilon-near-zero crossing and tunable dielect
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Georgia Theano Papadakis, Harry A. Atwater Jr., and Artur Davoyan "Tunable graphene-based hyperbolic metamaterials: experimental demonstration and outlook (Conference Presentation)", Proc. SPIE 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII, 112840U (9 March 2020); https://doi.org/10.1117/12.2545064
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KEYWORDS
Metamaterials
Dielectrics
Graphene
Active optics
Doping
Heterojunctions
Nanophotonics
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