Core-shell ZnO nanorod lasers

Visimberga, Giuseppe; Faulkner, Colm C.; Boese, Markus; O'Dwyer, Colm

Core-shell ZnO nanorod lasers

Files

ECS221_Seattle_2012_ZnO.pdf(2.78 MB)

Accepted version

Date

2012-01

Authors

Visimberga, Giuseppe

Faulkner, Colm C.

Boese, Markus

O'Dwyer, Colm

Publisher

Electrochemical Society

Published Version

10.1149/1.3701525

Abstract

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.

Keywords

Nanorods , Electric excitation , Energy gap , Lasers , Optical pumping , Photoexcitation , Refractive index , Semiconductor materials , Vapors , Zinc oxide , Condensation process , Core-shell , Crystal face , Dielectric oxides , Excitation power , Fused silica substrates , Lasing action , Metallic coating , Metallic reflectors , Mirror facets , Near band edge emissions , Room-temperature ultraviolet lasing , Vapor transport , Wide-band-gap semiconductor , Zinc oxide nanorods , ZnO nanorod

Citation

Visimberga, G., Faulkner, C. C., Boese, M. and O'Dwyer, C. (2012) 'Core-Shell ZnO Nanorod Lasers', ECS Transactions, 45(7), pp. 51-59. doi: 10.1149/1.3701525