Mode splitting in photoluminescence spectra of a quantum-dot-embedded microcavity

Hu, C. Y.; Zheng, H. Z.; Zhang, J. D.; Zhang, H.; Yang, F. H.; Zeng, Y. P.
February 2003
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p665
Academic Journal
A microcavity structure, containing self-assembled InGaAs quantum dots, is studied by angle-resolved photoluminescence (PL) spectroscopy. A doublet with the splitting energy of 0.5-1.5 nm appears when the detection angle is larger than 35°. This doublet is identified as mode splitting (not the Rabi splitting) by polarization measurements. We find that it is the considerable deviation of the cavity-mode frequency from the central frequency of the stop band that makes the TE and TM cavity modes split more discernibly. The inhomogeneous broadening of quantum dots gives the TE and TM cavity modes a chance to show up simultaneously in the PL spectra.


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