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Published March 27, 2023 | Published
Journal Article Open

Thermal metasurface with tunable narrowband absorption from a hybrid graphene/silicon photonic crystal resonance


We report the design of a tunable, narrowband, thermal metasurface that employs a hybrid resonance generated by coupling a tunable permittivity graphene ribbon to a silicon photonic crystal. The gated graphene ribbon array, proximitized to a high quality factor Si photonic crystal supporting a guided mode resonance, exhibits tunable narrowband absorbance lineshapes (Q > 10,000). Actively tuned Fermi level modulation in graphene with applied gate voltage between high absorptivity and low absorptivity states gives rise to absorbance on/off ratios exceeding 60. We employ coupled-mode theory as a computationally efficient approach to elements of the metasurface design, demonstrating an orders of magnitude speedup over typical finite element computational methods.

Additional Information

© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. The authors thank Michelle Povinelli and Shanhui Fan for useful discussions. Funding. Defense Advanced Research Projects Agency (HR00111820046). Data availability. Data underlying the results presented in this paper are available from the corresponding authors upon reasonable request. The authors declare no conflicts of interest.

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August 22, 2023
October 20, 2023