Opt Lett. 2018 Nov 15;43(22):5512-5515. doi: 10.1364/OL.43.005512.
In this Letter, we demonstrate a whispering-gallery-mode (WGM) microsphere resonator. The device is fabricated by fusion splicing a section of no-core fiber with multimode fiber (MMF) and single-mode fiber at its two ends. The open end of the MMF is etched to create an arc-shaped cavity, with a microsphere glued at its bottom. When the arc of the cavity bottom and microsphere surface are tangent, part of the incident light is coupled into the microsphere and travels exactly one circle before being directed back to the MMF core along the tangent line and exciting the WGM. The device has a Q-factor of 1.21×10, and is robust in structure and low in cost.
在这封信件中，我们展示了一种回音壁模式（WGM）微球谐振器。该器件通过熔接将一段无芯光纤与多模光纤（MMF）和单模光纤在其两端连接而成。MMF 的开口端被刻蚀成弧形腔，在其底部胶合一个微球。当腔底的弧形和微球表面相切时，部分入射光被耦合到微球中，并在沿着切线返回 MMF 芯激发 WGM 之前精确地沿圆周传播一圈。该器件的 Q 因子为 1.21×10，具有结构坚固、成本低廉的特点。
