In a microcavity, light-matter coupling is quantified by the vacuum-Rabi frequency Omega(R). When Omega(R) is larger than radiative and nonradiative loss rates, the system eigenstates (polaritons) are linear superposition of photonic and electronic excitations, a condition actively investigated in diverse physical implementations. Recently, a quantum electrodynamic regime (ultrastrong coupling) was predicted when Omega(R) becomes comparable to the transition frequency. Here we report signatures of this regime in a quantum-well intersubband microcavity. Measuring the cavity-polariton dispersion in a room-temperature linear optical experiment, we directly observe the antiresonant light-matter coupling and the photon-energy renormalization of the vacuum field.

Signatures of the ultrastrong light-matter coupling regime

A. TREDICUCCI;BELTRAM, Fabio
2009

Abstract

In a microcavity, light-matter coupling is quantified by the vacuum-Rabi frequency Omega(R). When Omega(R) is larger than radiative and nonradiative loss rates, the system eigenstates (polaritons) are linear superposition of photonic and electronic excitations, a condition actively investigated in diverse physical implementations. Recently, a quantum electrodynamic regime (ultrastrong coupling) was predicted when Omega(R) becomes comparable to the transition frequency. Here we report signatures of this regime in a quantum-well intersubband microcavity. Measuring the cavity-polariton dispersion in a room-temperature linear optical experiment, we directly observe the antiresonant light-matter coupling and the photon-energy renormalization of the vacuum field.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/3664
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