期刊
PHYSICAL REVIEW B
卷 79, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.201303
关键词
microcavities; micro-optics; optical dispersion; polaritons; renormalisation; semiconductor quantum wells
资金
- EC Research and Training Network POISE
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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