Exciton-phase mode interaction in a microcavity

A. C. H. Cheung, Benjamin D. Simons, P. B. Littlewood

Z. L. Zhang, Masao Nishioka, Claude Weisbuch +1 more

We report new results on a photon-exciton interaction in a λ cavity having two kinds of quantum wells (QWs) with the thickness of 62 and 90 Å which are sited at the antinode and two nodes of the standing wave, respectively. By measuring the reflectivity spectrum of the quantum microcavity, mode splitting (two dips) is observed when the photons in the cavity are resonant with the excitons of 62 Å QWs at 14 K. However, no mode splitting (one dip) is observed when the microcavity is tuned to the quantized energy of the excitons arising from the 90 Å QWs. The reason is the difference of the coupled interaction between photons and excitons due to the standing wave distribution of the optical field in the microcavity. The above results clearly demonstrate the controllability of quantum electrodynamics effects due to the confined optical mode (i.e., the standing wave) in a high-Q microcavity.

Zhao-Xian Yu, Zhi-Yong Jiao, Fuping Liu

Alexander N. Poddubny, Михаил Михайлович Глазов, Nikita S. Averkiev

A theory of nonlinear emission of localized excitons coupled to the optical mode of the microcavity is presented.Numerical results are compared with analytical ones.The effects of exciton-exciton interaction within the quantum dots and with the reservoir formed by non-resonant pumping are considered.It is demonstrated that the nonlinearity due to the interaction strongly affects the shape of the emission spectra.The collective superradiant mode of the excitons is shown to be stable against the nonlinear effects.

Zhao-Xian Yu, Zhi-Yong Jiao, Bing-Hao Xie +1 more

June‐Koo Kevin Rhee, Theodore B. Norris, D. S. Citrin +3 more

Semiconductor quantum microcavities are interesting physical systems in which fundamental interactions between light and excitons can be explored. For example, in the weak - coupling limit, modified excitonic spontaneous emission can be observed. In the strong-coupling limit, the cavity field modes and the quantum well exciton modes become coupled; the normal modes of the system are "cavity-polaritons" [1,2]. For in-plane wavevectors k// near zero, the normal modes are split by the dipole coupling between the excitons and the cavity vacuum field. This splitting is often referred to as a vacuum-Rabi splitting (VRS), as it has the same physical origin as the VRS observed in the interactions of atoms with single-mode cavities. The physical system in this work consists of a λ planar microcavity formed by two distributed-Bragg reflectors, with five GaAs quantum wells situated in the center of the cavity. In all the experiments described here, the exciton and cavity modes are on resonance (the low-field VRS is 6 meV for this sample).