Amplification Of Strong Coupling In The System Of Perovskite Nanowire Coated By The Metal Film

Organic inorganic perovskite nanowires with strong photon confinement and isotropy have attracted great attention due to their optical and electrical properties.Understanding the light interaction in nanowire cavities is of fundamental and practical significance in designing low-power nanoscale light sources.In this work,we found that there is a strong exciton photon interaction in perovskite nanowires,which can be enhanced by surface plasmon.More importantly,the characteristic anti crossover behavior is observed near the exciton resonance peak of the hybrid perovskite/SiO2/Ag line,and the measured Rabi splitting energy is up to 303.2 meV.In contrast,in the absence of surface plasmon excitation,the Rabi splitting energy is only 236.4 meV.In addition,the relationship between the splitting energy and various modes in the perovskite nanowires and the thickness of the SiO2 layer was also investigated.We found that it is possible to control the Rabi splitting energy:i)the greater the thickness of Ag layer,the greater the Rabi splitting energy;ii)the greater the thickness of SiO2 layer,the smaller the Rabi splitting energy.Similarly,we also found that the Rabi splitting energy has a linear relationship with the refractive index of the SiO2 layer.In addition,the nonlinear Fano resonance in the perovskite nanostructure was investigated by simulation.Firstly,the nonlinear Fano resonance is simulated in perovskite nanoparticles.On this basis,Fano resonance was found in the perovskite nanosheets.Finally,Fano resonance is found in the periodic structure with periodic V-shaped nano grooves.These findings provide basic insights for perovskite nanowires in the design of optical devices such as electrically pumped and ultra-low threshold lasers,and promote the development of exciton photon coupling to continuous wave and electrically driven polaron lasers.