Exciton–polariton formation at room temperature in a planar ZnO resonator structure

• Published in: Applied physics. B, Lasers and optics Vol. 93; no. 2-3; pp. 331 - 337
• Main Authors: Schmidt-Grund, R., Rheinländer, B., Czekalla, C., Benndorf, G., Hochmuth, H., Lorenz, M., Grundmann, M.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.11.2008; Springer
• Subjects: Bragg reflectors; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dispersions; Electron states; Engineering; Exact sciences and technology; Excitation; Fundamental areas of phenomenology (including applications); Holes; Laser optical systems: design and operation; Lasers; Magnesium oxide; Optical Devices; Optics; Oxides; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Polaritons (including photon-phonon and photon-magnon interactions); Quantum Optics; Rapid Communication; Resonators; Resonators, cavities, amplifiers, arrays, and rings; Zinc oxide; 78.55.Et; 42.60.Da; 71.36.+c; Reflectivity; Zirconia; Excitons; II-VI semiconductors; Ambient temperature; Photoluminescence; Binary compounds; Polaritons; Cavity resonators; Zinc Oxides; Bragg reflection; Mirrors
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-008-3160-x

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 ZrO 2 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.