Surface Effect on Optical Bistability in Coupled Exciton-Phonon Systems Inside a Cavity.

摘要

When laser beam are directed on an exciton-phonon coupling system inside an optical cavity, the cavity field intensity is investigated as a function of the driving field intensity for various distances between the sample and a metallic surface representing one of the mirrors of the cavity. Optical bistability is found to be induced by the surface when the cavity field is on resonance with the excitonic transition frequency. It is also found that at the threshold, the direction of switch of the optical bistability can be controlled by adjusting the distance from the surface. The investigation of optical properties of molecular systems near a solid surface has been of interest from both the fundamental and practical points of view. Exciton phonon coupling systems such as organic semiconductors have been considered very recently instead of single molecular systems located near ideal metal surfaces. Surface-induced optical bistability has been discovered and its nature and origin investigated.