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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15834–15839

Fiber pigtailed thin wall capillary coupler for excitation of microsphere WGM resonator

Hanzheng Wang, Xinwei Lan, Jie Huang, Lei Yuan, Cheol-Woon Kim, and Hai Xiao  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15834-15839 (2013)

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In this paper, we demonstrate a fiber pigtailed thin wall capillary coupler for excitation of Whispering Gallery Modes (WGMs) of microsphere resonators. The coupler is made by fusion-splicing an optical fiber with a capillary tube and consequently etching the capillary wall to a thickness of a few microns. Light is coupled through the peripheral contact between inserted microsphere and the etched capillary wall. The coupling efficiency as a function of the wall thickness was studied experimentally. WGM resonance with a Q-factor of 1.14 × 104 was observed using a borosilicate glass microsphere with a diameter of 71 μm. The coupler operates in the reflection mode and provides a robust mechanical support to the microsphere resonator. It is expected that the new coupler may find broad applications in sensors, optical filters and lasers.

© 2013 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.5750) Optical devices : Resonators

ToC Category:

Original Manuscript: April 26, 2013
Revised Manuscript: June 7, 2013
Manuscript Accepted: June 14, 2013
Published: June 25, 2013

Hanzheng Wang, Xinwei Lan, Jie Huang, Lei Yuan, Cheol-Woon Kim, and Hai Xiao, "Fiber pigtailed thin wall capillary coupler for excitation of microsphere WGM resonator," Opt. Express 21, 15834-15839 (2013)

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