Publication

Exciton-photon dynamics in weakly and strongly excited semiconductor microcavities

Romuald Houdré, Ursula Oesterle, Jean-Louis Staehli
1998
Journal Articles

Abstract

We report on the optical response of a semiconductor microcavity featuring a strong exciton-photon coupling. The weak excitation regime is investigated experimentally by means of time-resolved transmission and four-wave mixing experiments. The influence of electronic disorder on the coherent exciton-photon dynamics is discussed in terms of tl-ie solutions of the Maxwell-Bloch equations. The high excitation regime is investigated by using transient sub-picosecond pump-probe experiments. Optical amplification of the probe beam (up to a factor of five), as well as a fundamental change of the optical spectra: have been found close to and above the exciton saturation density. The observed oscillations are corresponding to the Rabi frequency of the excitons in the pump field.

Official source

https://infoscience.epfl.ch/entities/publication/491e0d69-2a4a-4038-bb66-df91cb39e7f8

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Romuald Houdré, Ursula Oesterle, Jean-Louis Staehli
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/491e0d69-2a4a-4038-bb66-df91cb39e7f8

About this result

Related concepts (32)

Optical amplifier

An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics. They are used as optical repeaters in the long distance fiberoptic cables which carry much of the world's telecommunication links.

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Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Raman amplification

Raman amplification ˈrɑːmən is based on the stimulated Raman scattering (SRS) phenomenon, when a lower frequency 'signal' photon induces the inelastic scattering of a higher-frequency 'pump' photon in an optical medium in the nonlinear regime. As a result of this, another 'signal' photon is produced, with the surplus energy resonantly passed to the vibrational states of the medium. This process, as with other stimulated emission processes, allows all-optical amplification.

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Exciton-photon dynamics in weakly and strongly excited semiconductor microcavities

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