• Photonics Research
  • Vol. 9, Issue 4, 432 (2021)
Shengnan Zhang1、2, Yufeng Li1、3、*, Peng Hu1、2, Zhenhuan Tian1、2, Qiang Li1、2, Aixing Li1、2, Ye Zhang1、2, and Feng Yun2、4、*
Author Affiliations
  • 1Shaanxi Provincial Key Laboratory of Photonics & Information Technology, Xi’an Jiaotong University, Xi’an 710049, China
  • 2Solid-State Lighting Engineering Research Center, Xi’an Jiaotong University, Xi’an 710049, China
  • 3e-mail: yufengli@mail.xjtu.edu.cn
  • 4e-mail: fyun2010@mail.xjtu.edu.cn
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    DOI: 10.1364/PRJ.413796 Cite this Article Set citation alerts
    Shengnan Zhang, Yufeng Li, Peng Hu, Zhenhuan Tian, Qiang Li, Aixing Li, Ye Zhang, Feng Yun. Realization of directional single-mode lasing by a GaN-based warped microring[J]. Photonics Research, 2021, 9(4): 432 Copy Citation Text show less

    Abstract

    Multimode and random directionalities are major issues restricting the application of whispering gallery mode microcavity lasers. We demonstrated a 40 μm diameter microring with an off-centered embedded hole and warped geometry from strained III-nitride quantum well multilayers. Single-mode directional whispering gallery mode lasing was achieved by the warped structure and high-order mode suppression induced by the off-centered hole. In addition, the introduction of the off-centered hole reduced the lasing threshold from 3.24 to 2.79 MW/cm2 compared with the warped microdisk without an embedded hole while maintaining a high-quality factor of more than 4000. Directional light emission in 3D was achieved and attributed to the warped structure, which provides a vertical component of the light emission, making it promising for building multifunctional coherent light sources in optoelectronic integration.
    RoC=16(t1+t2+t3)3ε1t1(t2+t3)+ε2(t1+t2)t3,

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    Q=λ/Δλ,

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    Shengnan Zhang, Yufeng Li, Peng Hu, Zhenhuan Tian, Qiang Li, Aixing Li, Ye Zhang, Feng Yun. Realization of directional single-mode lasing by a GaN-based warped microring[J]. Photonics Research, 2021, 9(4): 432
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