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Amplified Tunnelling from a Pair of Balanced Loss and Gain Cavities

Abstract An exceptional point (EP) or pole is an extraordinary physical phenomenon of a parity-time (PT)-symmetric system. In this article, we design a compact pseudo-PT-symmetric system in which a gain resonator and a loss resonator are connected by a metal film. An amplified tunnelling is found with the coupling of the two resonators induced by the plasmonic resonance. Both EP and the pole effects can result in a jump in the transmittance and reflectance with nearly equal, large values. The pole effect can be achieved by adjusting either the gain coefficient or the incidence angle.