Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2823584
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We report on the coupling of optical transitions between excited conduction subbands in GaAs/AlGaAs heterostructures with the resonant photonic mode of a semiconductor microcavity. The coupling is found to increase with temperature, owing to the thermal excitation of carriers from the ground subband and, thanks to the large dipole-matrix element of the excited-state transition, a record splitting of 60 meV is shown in the room-temperature reflectance. The importance of translating the angle-dependent spectra into energy-wavevector dispersion when the coupling is so large is highlighted, and a theoretical fitting procedure is used to extract the value of the vacuum-field Rabi energy.
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