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Due graphene’s robustness as an element in a variety of optoelectronic and photonic platforms, the material can be coupled to other resonant structures to realize functionality beyond that predicted by its constituent optical properties alone. Here we demonstrate a tunable graphene metasurface that exhibits near-unity absorptance over a narrowband range of wavelengths. We hybridize a guided mode resonance of a silicon photonic crystal with the localized surface plasmon of a graphene ribbon to produce a critically coupled system. We investigate various geometric configurations to realize a diversity of Fano lineshapes and incorporate coupled mode theory to quantitatively describe our results.
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Arun Nagpal, Ming Zhou, Ognjen Ilic, Zongfu Yu, Harry A. Atwater, "Tunable narrowband IR absorption in graphene nanoribbon/silicon photonic crystal coupled resonators," Proc. SPIE PC12003, 2D Photonic Materials and Devices V, PC120030E (5 March 2022); https://doi.org/10.1117/12.2610369