title: Optical bistability and nonlinearity of coherently coupled exciton-plasmon systems.
abstract: We theoretically investigated optical third-order nonlinearity of a coherently coupled exciton-plasmon hybrid system under a strong control field with a weak probe field. The analytic formulas of exciton population and effective third-order optical susceptibility of the hybrid of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) were deduced. The bistable exciton population and the induced bistable nonlinear absorption and refraction response were revealed. The bistability region can be tuned by adjusting the size of metal nanoparticle, interparticle distance and intensity of control field. Our results have perspective applications in optical information processing based on resonant coupling of exciton-plasmon.
authors.affiliation: Department of Physics, Wuhan University, Wuhan, China.
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Li
authors.forename: Nam-Chol
authors.initials: NC
authors.lastname: Kim
authors.forename: Mu-Tian
authors.initials: MT
authors.lastname: Cheng
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Hao
authors.forename: Qu-Quan
authors.initials: QQ
authors.lastname: Wang
mesh_terms: D004574:Electromagnetic Fields; D053768:Metal Nanoparticles; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D045663:Quantum Dots; D020349:Surface Plasmon Resonance / Q000379:methods*