Plasmonic Hybrid Devices with Duo Optical Characteristics –Conventional Mode Coupling and Parity Time Symmetry

To study the mode coupling mechanism of plasmonic hybrid device with nanocavity that has passive/active medium in the nanocavity, and the study will lead to demonstration of plasmonic hybrid device that has duo optical characteristics i.e. possessing both conventional mode coupling as well as parity time symmetry. Our recent work has shown that SPP can couple effectively with the nanocavity modes in a plasmonic hybrid nanocavity device, leading to Rabi-analogue split. When the passive medium inside the nanocavity is an active medium that can effectively couple the active medium luminescence to the SPP/nanocavity coupled mode was observed. This led to the observation of parity time symmetry–like characteristics and we attributed it to the suppression of the nanocavity loss.

From our theoretical analysis, we can see that the plasmonic hybrid device with active medium could be designed with a strong parity time symmetry property (PTS). This needs further investigation to appreciate its physics. This proposal seeks to investigate theoretically and experimentally on the mode coupling mechanism of plasmonic hybrid device; how the design can be tuned so that it can have conventional mode coupling mode/PTS and finally demonstrating a device with duo optical characteristics – conventional mode coupling and PTS.