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

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 SiO{sub 2} 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.
Authors:
; ; ;  [1] ;  [1] ;  [2]
  1. Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan (China)
  2. (China)
Publication Date:
OSTI Identifier:
22398801
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; FABRICATION; GAIN; GLASS; ION BEAMS; MEMBRANES; MILLING; MONOCRYSTALS; OPTICAL PUMPING; PHOTONS; SILICA; SILICON OXIDES; SUBSTRATES; ZINC OXIDES