Abstract
Abstract We theoretically explored the optical bistability in parity-time-symmetric coupled micro-cavities, where two cavities are coupled by photon tunnelling; one of the cavities contains Kerr-nonlinearity. Using Heisenberg-Langevin equations of motion we obtained steady state mean cavity photon number for different photon tunnelling strength, nonlinear strength and gain-to-loss ratio. A high degree of coherent influence and tunability via Kerr-nonlinear strength and photon tunnelling strength over the bistable behaviour is discussed. The impact of the exceptional point on the characteristics of bistability is also reported. The model system exhibits switching behaviour and tunable zero intensity window. Our result may be useful to design efficient all-optical switch and optical sensor.
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