We conclusively explain the different lasing mode energies in ZnO nano- and microcavities
observed by us and reported in literature. The limited penetration depth of usually used excitation
lasers results in an inhomogeneous spatial gain region depending on the structure size and
geometry. Hence, weakly or even nonexcited areas remain present after excitation, where modes
are instantaneously suppressed by excitonic absorption. We compare the effects for ZnO
microwires, nanowires, and tetrapod-like structures at room temperature and demonstrate that the
corresponding mode selective effect is most pronounced for whispering-gallery modes in microwires
with a hexagonal cross section. Furthermore, the absorptive lasing mode suppression will be
demonstrated by correlating the spot size of the excitation laser and the lasing mode characteristic
of a single ZnO nanowire.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:23548 |
| Date | 06 August 2018 |
| Creators | Wille, Marcel, Michalsky, Tom, Krüger, Evgeny, Grundmann, Marius, Schmidt-Grund, Rüdiger |
| 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, 061102 |
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