Propagation of Excitonic Polaritons in a Microcavity

✍ Scribed by Freixanet, T. ;Sermage, B. ;Tiberj, A. ;Thierry-Mieg, V.

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 182 KB
• Volume: 178
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200003)178:1<133::aid-pssa133>3.0.co;2-9

✦ Synopsis

By exciting resonantly a microcavity with a pulsed laser beam, we have observed the in-plane propagation of excitonic cavity polaritons on distances much greater than the wavelength. The initial in-plane wave vector is conserved during several tens of picoseconds showing it is a good quantum number for cavity polaritons. The polariton group velocities were measured both as a function of the in-plane wave vector and detuning. Propagation is larger at negative detunings where polaritons have a light effective mass. The observations are in good agreement with a simple two-oscillator model.