We report on room temperature phonon-assisted whispering gallery mode (WGM) lasing in ZnO
microwires. For WGM laser action on the basis of the low gain phonon scattering process high
quality resonators with sharp corners and smooth facets are prerequisite. Above the excitation
threshold power PTh of typically 100 kW/cm2, the recombination of free excitons under emission of
two longitudinal optical phonons provides sufficient gain to overcome all losses in the microresonator
and to result in laser oscillation. This threshold behavior is accompanied by a distinct change of the
far and near field emission patterns, revealing the WGM related nature of the lasing modes. The
spectral evolution as well as the characteristic behavior of the integrated photoluminescence
intensity versus the excitation power unambiguously proves laser operation. Polarization-resolved
measurements show that the laser emission is linear polarized perpendicular to the microwire axis
(TE).
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:31211 |
| Date | 11 August 2018 |
| Creators | Michalsky, Tom, Wille, Marcel, Dietrich, Christof P., Röder, Robert, Ronning, Carsten, Schmidt-Grund, Rüdiger, Grundmann, Marius |
| Contributors | Universität Jena |
| Publisher | American Institute of Physics, Universität Leipzig |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 0003-6951, 1077-3118, 211106 |
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