Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 36, Issue 7, Pages 1731-1737Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.36.001731
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Funding
- National Natural Science Foundation of China (NSFC) [11674117]
- 973 Program [2014CB921301]
- Natural Science Foundation of Hubei Province [2015CFA040, 2017CFB526]
- Educational Commission of Hubei Province [D20172803]
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We investigate the optical bistability of graphene in parity-time-symmetric (PT-symmetric) photonic lattices incorporated with a defect at terahertz frequencies. The field localization of the defect mode can strengthen the nonlinearity of graphene to achieve low-threshold bistability. The nonlinearity is further enhanced, and the bistability threshold decreases, by increasing the gain-loss factor in the PT-symmetric structure. The interval of upper and lower bistability thresholds is broadened as the exceptional points split. Moreover, we show the phase transition between bistability and nonbistability by modulating the incident wavelength and chemical potential of graphene. The study may find great applications in all-optical switches and optical storage. (C) 2019 Optical Society of America
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