Strong Light-matter Coupling In Microcavities Of Tamm Plasmon

Metal-distributed Bragg reflector can support special optical Tamm states.Compared with the surface plasmon mode supported by metal film,OTS mode is not only easier to be excited by TE and TM polarized light at the same time,but also has a narrower linewidth,which can generate stronger local electric field at the interface.Therefore,it has become a research hotspot in micro-nanophotonics,and has an overall application prospect in filtering,high sensitive sensors,optical switches,optical logic devices and so on.In this paper,we focus on the design of metal-DBR Tamm plasmon microcavity and the strong coupling interaction between Tamm plasmon and exciton.1.Study of Tamm plasmon and its interaction with exciton in metal superstructure surface-DBR structure.In the traditional Tamm plasmon microcavity with metal thin film-DBR structure,by structuring the metal thin film to form a superstructure surface,we find that adjusting the structural parameters of the superstructure surface can change the reflection phase of light on its surface,thus changing the resonance position of the Tamm plasmon without changing other structural parameters,which can provide the regulation of the Tamm plasmon mode.More freedom.In addition,compared with the traditional metal thin film-DBR structure,we find that the introduction of super-surface and its regulation of reflective phase make the metal super-surface-DBR structure support the Tamm plasmon resonance at the same wavelength with a smaller thickness of spacer,which can effectively reduce the mode volume.On this basis,the interaction between Tamm plasmon and exciton in metal thin film-DBR and metal super-surface-DBR structures is studied comparatively.We find that only weak coupling without Rabi splitting occurs in traditional metal thin film-DBR when a small number of excitons are placed in the spacer layer,while strong coupling with obvious Rabi splitting occurs in metal super-DBR.2.Study on the interaction between Tamm plasmon and exciton in metal film-DBR-metal film structure.A metal-DBR-metal structure supporting double Tamm plasmon is designed.It is found that when the thickness of the spacer on both sides of the DBR is close,the two resonances of the metal interface on both sides of the DBR will couple with the Tamm plasmon mode of the same wavelength,and the coupling strength increases with the decrease of the refractive index contrast in the DBR.By introducing exciton material into the spacer on the side of metal-DBR-metal structure,we simulated and calculated the reflection spectra.It was found that the Rabi splitting size produced by the coupling of Tamm plasmon and exciton could reach 710 meV in this case,which increased by 540 meV compared with the Rabi splitting size observed in metal-DBR structure supporting only a single Tamm plasmon,and the thickness decreased by 900 nm.At the same time,according to the quantum coupling theory model,we analyze the strong interaction between single Tamm plasmon and double Tamm plasmon and exciton.The theoretical analysis results are consistent with the simulation results.We find that the coupling strength of coupled double Tamm plasmon and exciton is nearly four times higher than that of single Tamm plasmon and exciton,which provides a new feasible way to realize the ultra-strong coupling of plasmon and exciton.