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Open Access Nano Express

Random Lasing Action from Randomly Assembled ZnS Nanosheets

HY Yang1, SF Yu1*, J Yan2 and LD Zhang2

Author Affiliations

1 School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore

2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 230031, Heifei, China

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Nanoscale Research Letters 2010, 5:809-812  doi:10.1007/s11671-010-9563-8

Published: 9 March 2010

Abstract

Lasing characteristics of randomly assembled ZnS nanosheets are studied at room temperature. Under 266-nm optical excitation, sharp lasing peaks emitted at around 332 nm with a linewidth less than 0.4 nm are observed in all directions. In addition, the dependence of lasing threshold intensity with the excitation area is shown in good agreement with the random laser theory. Hence, it is verified that the lasing characteristics of randomly assembled ZnS nanosheets are attributed to coherent random lasing action.

Keywords:
ZnS nanosheets; Random lasing; Ultraviolet