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Spherical cavity-mode laser with self-organized CuCl microspheres.

M Nagai, F Hoshino, S Yamamoto

    Optics Letters
    |January 12, 2008
    PubMed
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    We achieved exciton-polariton lasing in copper chloride (CuCl) microspheres using ultraviolet laser pulses. The biexciton-to-longitudinal-exciton transition was identified as the key mechanism for this low-threshold lasing phenomenon.

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    Area of Science:

    • Condensed matter physics
    • Quantum optics
    • Materials science

    Background:

    • Exciton-polaritons are quasiparticles formed from the strong coupling of excitons and photons.
    • Semiconductor microcavities offer a promising platform for observing quantum phenomena like Bose-Einstein condensation and lasing.
    • Achieving lasing in microstructures requires efficient light confinement and high-gain materials.

    Purpose of the Study:

    • To investigate the potential of semiconductor microspheres for exciton-polariton lasing.
    • To determine the lasing threshold and identify the underlying optical transition.
    • To explore the use of copper chloride (CuCl) as a material for microcavity exciton-polariton devices.

    Main Methods:

    • Fabrication of CuCl microspheres with controlled diameters (micrometer scale) via melting bulk crystals.
    • Excitation of microspheres using subpicosecond ultraviolet laser pulses at low temperatures.
    • Analysis of emission spectra to identify lasing characteristics and spectral features.

    Main Results:

    • Successful demonstration of exciton-polariton lasing in CuCl microspheres utilizing spherical cavity modes.
    • Observation of a low lasing threshold of 1 nJ/pulse, equivalent to 10^9 photons/pulse.
    • Identification of the biexciton-to-longitudinal-exciton transition as the primary mechanism responsible for the observed lasing.

    Conclusions:

    • Semiconductor microspheres are viable microcavities for achieving exciton-polariton lasing.
    • The biexciton-to-longitudinal-exciton transition provides an efficient pathway for polariton lasing in CuCl.
    • These findings pave the way for developing novel optoelectronic devices based on polaritonics.