Browsing by Author "Chen, Jee-Wei"

Now showing 1 - 1 of 1

Manipulation of exciton and photon lasing in a membrane-type ZnO microcavity
(2015-03-30)
Lai, Ying-Yu
;
Chen, Jee-Wei
;
Chang, Tsu-Chi
;
Chou, Yu-Hsun
;
Lu, Tien-Chang
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. (C) 2015 AIP Publishing LLC.