Control of Rabi-splitting energies of exciton polaritons in CuI microcavities

Masaaki Nakayama (), Masanobu Kameda, Toshiki Kawase and DaeGwi Kim

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 2, 1-5

Abstract: We have investigated the active-layer-thickness dependence of exciton-photon interactions in CuI microcavities. The active layer thickness was changed from λ/2 to 2λ, where λ corresponds to an effective resonant wavelength of the lowest-lying exciton. In the CuI active layer, thermal strain removes the degeneracy of the heavy-hole (HH) and light-hole (LH) excitons at the Γ point. Angle-resolved reflectance spectra measured at 10 K demonstrate the strong coupling between the HH and LH excitons and cavity photon, resulting in the formation of three cavity-polariton branches: the lower, middle, and upper polariton branches. The energies of the three cavity-polariton modes as a function of incidence angle are reasonably explained using a phenomenological Hamiltonian to describe the exciton-photon strong coupling. It is found that the interaction energies of the cavity-polariton modes, the so-called vacuum Rabi-splitting energies, are systematically controlled from 29 (50) to 48 (84) meV for the LH (HH) exciton by changing the active layer thickness from λ/2 to 2λ. The active-layer-thickness dependence of the Rabi-splitting energies is semi-quantitatively explained by a simple model. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Topical issue: Excitonic Processes in Condensed Matter; Nanostructured and Molecular Materials. Guest editors: Maria Antonietta Loi; Jasper Knoester and Paul H. M. van Loosdrecht (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2012-30503-6

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