Characteristics of cavity polaritons in a CuBr microcavity

We report the characteristics of cavity polaritons in a CuBr microcavity consisting of a λ /2-thick CuBr active layer and HfO 2 /SiO 2 distributed Bragg reflectors: λ corresponds to an effective resonant wavelength of the lowest-lying exciton. The excitonic system of a CuBr crystal has three kinds o...

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Bibliographic Details
Published in:	The European physical journal. B, Condensed matter physics Vol. 85; no. 11
Main Authors:	Katakani, Y., Kawase, T., Kim, D., Nakayama, M.
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer-Verlag 01-11-2012 EDP Sciences Springer
Subjects:	Complex Systems Condensed Matter Physics Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Fluid- and Aerodynamics Nanostructured and Molecular Materials Physics Physics and Astronomy Regular Article Solid State Physics Thin films and multilayers Topical issue: Excitonic Processes in Condensed Matter Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Copper bromide Angular resolution Dispersion relations Active layer Polaritons Rabi splitting Thin films Triplet state Phenomenological model Excitons Reflection spectrum Hamiltonians Oscillator strengths Microcavities
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Summary:	We report the characteristics of cavity polaritons in a CuBr microcavity consisting of a λ /2-thick CuBr active layer and HfO 2 /SiO 2 distributed Bragg reflectors: λ corresponds to an effective resonant wavelength of the lowest-lying exciton. The excitonic system of a CuBr crystal has three kinds of excitons labeled Z f , Z 1 , 2 , and Z 3 in which the Z f exciton originates from a triplet state. We have investigated the dispersion relations of the cavity polaritons in the CuBr microcavity with the use of angle-resolved reflectance spectroscopy. The experimental results demonstrate the formation of four cavity-polariton branches due to the strong coupling between the Z f , Z 1 , 2 , and Z 3 excitons and cavity photon. The cavity-polariton dispersions were well analyzed with a phenomenological Hamiltonian for the strong coupling. The evaluated Rabi-splitting energies are 28, 95, and 74 meV for the Z f , Z 1 , 2 , and Z 3 excitons, respectively. These Rabi-splitting energies reflect the magnitudes of the oscillator strengths of the relevant excitons. Furthermore, it was confirmed that the cavity polaritons are fully stable at room temperature. We discuss the temperature dependence of the cavity-polariton energies and detuning, comparing with that of the bare exciton.
ISSN:	1434-6028 1434-6036
DOI:	10.1140/epjb/e2012-30523-2