Manipulation of exciton and photon lasing in a membrane-type ZnO microcavity

Ying Yu Lai, Jee Wei Chen, Tsu Chi Chang, Yu Hsun Chou, Tien-chang Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We report on the fabrication and characterization of a membrane-type ZnO microcavity (MC). The ZnO membrane was cut from a single crystalline ZnO substrate by using focused ion beam milling, and was then placed onto a SiO2 substrate by using glass microtweezers. Through changing the pumping regime, manipulation of P-band exciton lasing and whispering-gallery mode (WGM) photon lasing could be easily achieved. P-band exciton lasing was observed only when the pumping laser was focused at the center of the ZnO MC with a small pumping size because of the innate ring-shaped WGM distribution. Furthermore, the lasing threshold of the ZnO MC could be reduced to an order lower by using a larger pumping spot because of the more favorable spatial overlap between the optical gain and WGM.

Original languageEnglish
Article number131106
JournalApplied Physics Letters
Volume106
Issue number13
DOIs
StatePublished - 30 Mar 2015

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