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Optical polariton properties in ZnSe-based planar and pillar structured microcavities

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  • Solid State and Materials
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Abstract

Strong coupling is demonstrated in monolithic ZnSe-based microcavities. Under nonresonant excitation the polariton dispersion has been investigated in dependence on the photon-exciton detuning for different excitation densities at low temperatures. For zero detuning indications of a polariton lasing threshold are observed like a k-space and energy dispersion narrowing of the lower polariton branch with increasing excitation density. Furthermore, it is observed that this effect is hampered for measurements at negative detunings as a result of the less effective polariton relaxation to the ground state. Latter results in the formation of a discrete polariton distribution at finite k values as known for the polariton bottleneck. In order to investigate the influence of a three-dimensional optical confinement on the polariton relaxation, pillar structured microcavities were fabricated. The formation of discrete polariton states in the k-space distribution is observed. Furthermore, indications for a softening of the k-conservation arising from the structural confinement are found leading to a more effective polariton relaxation. This process would be beneficial for the realization of efficient polariton lasing processes.

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Authors and Affiliations

  1. Semiconductor Optics, Institute of Solid State Physics, University of Bremen, P.O. Box 330440, 28334, Bremen, Germany

    K. Sebald & M. Seyfried

  2. CEA-CNRS-UJF group Nanophysique et Semiconducteurs, Institut Néel, Grenoble, France

    K. Sebald, A. Trichet, M. Richard & L. S. Dang

  3. Semiconductor Epitaxy, Institute of Solid State Physics, University of Bremen, P.O. Box 330440, 28334, Bremen, Germany

    S. Klembt, C. Kruse & D. Hommel

Authors
  1. K. Sebald
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  2. A. Trichet
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  3. M. Richard
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  4. L. S. Dang
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  5. M. Seyfried
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  6. S. Klembt
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  7. C. Kruse
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  8. D. Hommel
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Correspondence to K. Sebald.

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Sebald, K., Trichet, A., Richard, M. et al. Optical polariton properties in ZnSe-based planar and pillar structured microcavities. Eur. Phys. J. B 84, 381–384 (2011). https://doi.org/10.1140/epjb/e2011-20551-9

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  • DOI: https://doi.org/10.1140/epjb/e2011-20551-9

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