Journal
OPTICS EXPRESS
Volume 28, Issue 5, Pages 6443-6451Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.386453
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Funding
- National Key Research and Development Program of China [2016YFB0400801]
- Fundamental Research Funds for the Central Universities [XJJ2017011, Z201805198]
- National Natural Science Foundation of China [61574114, 61774121]
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To reduce the threshold and achieve unidirectional lasing emission in a whispering gallery mode microcavity, we propose and demonstrate a Galsl-based eccentric microring with an inner hole located off the center. Compared to microdisk with the same outer diameter, the eccentric microring structure exhibits a remarkable reduction of lasing threshold by up to 53%. The introduction of the hole disturbs and eventually suppresses the field distribution of the higher order modes. Laser emission with high unidirectionality with a far-field divergence angle of about 40 degrees has been achieved, meanwhile the Q factor of the whispering gallery modesis remains high as 6388. Finite-difference time-domain numerical simulation is carried out to prove that the far-field profile of the eccentric microring structure can be controlled by the position and the size of the hole. The properties of the whispering gallery mode microcavities are improved greatly through a simple structure and process, which has an important guiding significance to the research and development of the microcavity lasers. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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