Directional single-mode emission from coupled whispering gallery resonators realized by using ZnS microbelts

Hai Zhu, Siu Fung Yu, Qi Jie Wang, Chong Xin Shan, S. C. Su

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


Ring microcavities were formed by wrapping ZnS microbelts, which act as the waveguide and gain region of the microcavities on the surface of optical fibers. The ring microcavities with the formation of whispering gallery modes have lasing threshold lower (Q-factor higher) than that of the ZnS microbelts. The excitation of TM modes could also be suppressed by the ring geometries of ZnS microbelts. Furthermore, directional single-mode lasing was realized from a coupled asymmetric ring microcavity. The Vernier coupling effect and deformed geometry of the asymmetric ring microcavity were contributed to the stable single-mode operation and directional emission, respectively.
Original languageEnglish
Pages (from-to)1527-1529
Number of pages3
JournalOptics Letters
Issue number9
Publication statusPublished - 1 May 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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