Core-Shell ZnO Nanorod Lasers
| Autor: | Colm O'Dwyer, G. Visimberga, Colm C. Faulkner, Markus Boese |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Optical pumping
Materials science Silicon Dielectric oxides Refractive index Physics::Optics chemistry.chemical_element Mirror facets Dielectric Lasing action Metallic reflectors law.invention Semiconductor materials Zinc oxide nanorods Condensed Matter::Materials Science law Zinc oxide Vapor transport Condensation process Metallic coating Photoexcitation Core-shell ZnO nanorod Excitation power business.industry Lasers Wide-bandgap semiconductor Laser Fused silica substrates Energy gap Crystal face Wide-band-gap semiconductor chemistry Vapors Optoelectronics Nanorods Nanorod Room-temperature ultraviolet lasing business Lasing threshold Near band edge emissions Electric excitation |
| Zdroj: | ECS Transactions. 45:51-59 |
| ISSN: | 1938-6737 1938-5862 |
| DOI: | 10.1149/1.3701525 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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