Abstract
Optical bistability effect is investigated in a complex system composed of graphene and Thue–Morse photonic crystals (PCs). The Thue–Morse PCs submitted to parity-time−symmetry (PT−symmetry) are stacked alternatively with two dielectric slabs according to Thue–Morse sequence. Optical fractal states and the exceptional points (EPs) induced by the Thue–Morse PCs could greatly localize the electric fields. The optical third-order nonlinear effect of graphene has been enhanced by the strong local electric fields and subsequently, low-threshold optical bistability is achieved. The EPs splitting and the thresholds of optical bistability can be further decreased by modulating the gain−loss factor of dielectrics in the PT−symmetry. Otherwise, the optical bistable performance could be improved by the chemical potential of graphene as well. The study may have potential applications in all-optical switches.
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This study was funded by the Scientific Research Project of National Natural Science Foundation of China (NSFC) (51975542); the Scientific Research Project of Hubei University of Science and Technology (2021-22X21).
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Xu, H., Qin, Z., Liu, F. et al. Optical bistability of graphene in PT−symmetric Thue–Morse photonic crystals. J Mater Sci 57, 6524–6535 (2022). https://doi.org/10.1007/s10853-022-07038-6
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DOI: https://doi.org/10.1007/s10853-022-07038-6