Exciton–polariton formation at room temperature in a planar ZnO resonator structure
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- Schmidt-Grund, R., Rheinländer, B., Czekalla, C. et al. Appl. Phys. B (2008) 93: 331. doi:10.1007/s00340-008-3160-x
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We show the dispersion of exciton–polaritons in an all oxide planar resonator structure. A quasi-bulk ZnO film acts as active medium and as cavity. The mirrors are made of Bragg reflectors consisting of ZrO2 and MgO layers. Despite a limited structural perfection, we have observed a giant energy splitting of the exciton–polariton branches of about 78 meV at maximum using reflectivity and photoluminescence measurements.