Publication

Suppression of exciton-polariton light absorption in multiple quantum well Bragg structures

Benoît Marie Joseph Deveaud, Ursula Oesterle, Jean-Louis Staehli, Cristiano Ciuti
1999
Journal Articles

Abstract

A dramatic suppression of the light absorption by exciton-polaritons is observed after resonant excitation of the polaritonic modes in a multiple quantum well Bragg structure. We demonstrate that this is due to the formation of a dominant superradiant polariton mode. The stability of the superradiant mode is demonstrated at high excitation powers and at temperatures of up to 180 K. (C) 1999 Elsevier Science B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/45eb69ac-8497-4923-8411-d1bd9c9bf034

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Benoît Marie Joseph Deveaud, Ursula Oesterle, Jean-Louis Staehli, Cristiano Ciuti
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/45eb69ac-8497-4923-8411-d1bd9c9bf034

About this result

Related concepts (22)

Polariton

In physics, polaritons pəˈlærᵻtɒnz,_poʊ- are quasiparticles resulting from strong coupling of electromagnetic waves with an electric or magnetic dipole-carrying excitation. They are an expression of the common quantum phenomenon known as level repulsion, also known as the avoided crossing principle. Polaritons describe the crossing of the dispersion of light with any interacting resonance. To this extent polaritons can also be thought of as the new normal modes of a given material or structure arising from the strong coupling of the bare modes, which are the photon and the dipolar oscillation.

Exciton

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge. An exciton can form when a material absorbs a photon of higher energy than its bandgap. This excites an electron from the valence band into the conduction band.

Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

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Suppression of exciton-polariton light absorption in multiple quantum well Bragg structures

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