Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity

Virgili, T.; Coles, D.; Adawi, A. M.; Clark, C.; Michetti, P.; Rajendran, S. K.; Brida, D.; Polli, D.; Cerullo, G.; Lidzey, D. G.

Abstract

We study an organic semiconductor microcavity operating in the strong-coupling regime using fs pump-probe spectroscopy. By probing the induced absorption associated with the one-exciton to two-exciton transition, we are able to characterize the time-dependent population densities of states in the upper-and lower-polariton branches following impulsive excitation. We model the time-dependent polariton dynamics and provide direct evidence of a scattering process that returns upper-branch cavity polaritons to states in the exciton reservoir having a rate of (150 fs)(-1). A slower process similarly populates lower-branch polaritons by return scattering from the exciton reservoir.

Citation

Virgili, T., Coles, D., Adawi, A. M., Clark, C., Michetti, P., Rajendran, S. K., Brida, D., Polli, D., Cerullo, G., & Lidzey, D. G. (2011). Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity. Physical review B: Condensed matter and materials physics, 83(24), 245309. https://doi.org/10.1103/PhysRevB.83.245309

• Journal Article Type: Article
• Acceptance Date: Jun 20, 2011
• Online Publication Date: Jun 20, 2011
• Publication Date: Jun 20, 2011
• Journal: PHYSICAL REVIEW B
• Print ISSN: 1098-0121
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 83
• Issue: 24
• Article Number: ARTN 245309
• Pages: 245309
• DOI: https://doi.org/10.1103/PhysRevB.83.245309
• Keywords: Electronic, Optical and Magnetic Materials; Condensed Matter Physics
• Public URL: https://hull-repository.worktribe.com/output/400144