Research On The Strong Coupling Mechanism In Tamm Microcavity Integrated Into WS₂

Exciton polariton(EP),which is formed by microcavity photons and excitons under a strong coupling mechanism,has both light and matter properties.It is a lightweight quasiparticle for studying the interaction between light and matter.It provides an ultralow energy platform and has important application prospects in the fields of optoelectronics,micro-nano photon integration and quantum information.The microcavity incorporating the two-dimensional material can realize the room temperature excitation of EP,which overcomes the low temperature operation limitation of the conventional quantum well microcavity EP;at the same time,the Tamm plasma(OTP)formed by the metal-distributed Bragg mirror(M-DBR)structure Optical Tamm polariton)provides a strong light limit that can replace dual DBR microcavities for a simpler,more compact EP optoelectronic device that is easy to integrate on-chip.Related research is a hot topic in the recent academic circles.Among them,research on all-optical manipulation of this type of EP device needs to be further developed.This paper innovatively proposes to use the optical Stark effect and its spin/polarization sensitivity to manipulate EP,and provide theoretical support for the research of EP-based high-speed,low-power optical functional devices.Firstly,the basic characteristics of OTP in M-DBR structure are studied.On this basis,a single layer of WS2 is incorporated into the M-DBR structure,so that the excited OTP and the excitons in the single layer WS2 are strongly coupled to form EP.Through the reflection spectrum analysis,the iconic bimodal characteristic is observed.The two peaks are located on both sides of the exciton energy,corresponding to the upper and lower branches of the EP.Furthermore,the dispersion characteristics of the upper and lower EP branches and their relationship with the OTP and exciton mismatch are studied.The inverse cross-correlation phenomenon of the strong coupling mechanism and Rabi splitting are observed.The theoretical model analysis data in the study has achieved a good fit with the numerical simulation results.Secondly,the EP manipulation based on the optical Stark effect is studied.By designing the potential energy distribution of the M-DBR and WS2 hybrid structure(three three-dimensional barrier channels are etched in the structure),three EP waveguide channels are defined,and the EP modes of each channel under free-running conditions are independent of each other.The EP potential energy perturbation caused by the optical Stark pulse is used to control the coupling of EP between different channels.The parameters such as the Stark pulse width are precisely changed,and the control of the splitting and switching of EP between different channels is realized theoretically.In addition,for the energy valley selectivity of WS2,a polarization-sensitive Stark pulse regulation method is proposed to achieve EP regulation of different polarization states/spins.These studies,combined with the time-space coding characteristics of Stark's control of light,open the way for routing and addressing in quantum and photonic integration applications.