Polaritons in semiconductor microcavities : effect of Bragg confinement

Teaching polaritons new tricks

Semiconductor microcavities have attracted much recent interest because they utilize simultaneously 2D confinement of both excitons and photons in the same heterostructure. Strong coupling of these two states produces unique dynamics that can be well described in a quasiparticle state, the cavity polaritons. Their dispersion relation is dramatically modified with an apparent trap in k-space off...

On the nature and dynamics of low-energy cavity polaritons

Low-energy polaritons in semiconductor microcavities are important for many processes such as, e.g., polariton condensation. Organic microcavities frequently feature both strong exciton-photon coupling and substantial scattering in the exciton subsystem. Low-energy polaritons possessing small or vanishing group velocities are especially susceptible to the effects of such scattering that can ren...

Bragg diffraction of microcavity polaritons by a surface acoustic wave.

Bragg scattering of polaritons by a coherent acoustic wave is mediated and strongly enhanced by the exciton states resonant with the acoustic and optic fields in the intraband and interband transitions, respectively. In this case, in contrast with conventional acousto-optics, the resonantly enhanced Bragg spectra reveal the multiple orders of diffracted light. For polaritons in GaAs microcaviti...

Twin polaritons in semiconductor microcavities

Towards R-Space Bose-Einstein Condensation of Photonic Crystal Exciton Polaritons

Coupled states of semiconductor quantum well (QW) excitons and photons in a two dimensional (2D) periodic lattice of microcavities are analyzed theoretically, revealing allowed bands and forbidden gaps in the energy spectrum of exciton polaritons. Photonic crystal exciton polaritons have spatially uniform excitonic constituent set by flat QWs, but exhibit periodic Bloch oscillations in the plan...