Core-Shell ZnO Nanorod Lasers

Room-temperature ultraviolet lasing in [0001] oriented zinc oxide nanorods grown on silicon and fused silica substrates by a simple vapor transport and condensation process. These wide band-gap semiconductor nanorods form natural laser cavities with diameters varying from 150 to 350 nm and lengths u...

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Bibliographic Details
Published inECS transactions Vol. 45; no. 7; pp. 51 - 59
Main Authors Visimberga, G., Faulkner, C. C., Boese, M., O'Dwyer, C.
Format Journal Article
LanguageEnglish
Published The Electrochemical Society, Inc 27.04.2012
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Summary:Room-temperature ultraviolet lasing in [0001] oriented zinc oxide nanorods grown on silicon and fused silica substrates by a simple vapor transport and condensation process. These wide band-gap semiconductor nanorods form natural laser cavities with diameters varying from 150 to 350 nm and lengths up to 10 µm. Under optical excitation, surface-emitting lasing action was observed at 385 nm. The dielectric core-shell Al2O3@ZnO nanorods exhibit enhanced axial Fabry-Pérot resonating characteristics with (0001) crystal faces as mirror facets improved by a metallic reflector at one end. This metallic coating and dielectric oxide shell greatly increase near-band edge emission while reducing excitation power thresholds due to lower losses and increased optical density from improved refractive index mediated waveguiding during optical pumping.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.3701525