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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 15 — Jul. 18, 2011
  • pp: 14217–14222

Optically tunable microfiber-knot resonator

Zhe Chen, Vincent K. S. Hsiao, Xiaoqing Li, Zhen Li, Jianhui Yu, and Jun Zhang  »View Author Affiliations

Optics Express, Vol. 19, Issue 15, pp. 14217-14222 (2011)

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This paper demonstrates light-induced tuning of the optical spectrum by a microfiber-knot resonator overlaid with a photoresponsive liquid crystal (LC) mixture containing photosensitive diluents (non-mesogenic azobenzene molecules), a chiral dopant and a nematic LC. The high-quality resonator is made by drawing a single mode fiber to a micro-size diameter and causing the microfiber to self-twist into a knot. A thin layer of a photosensitive mixture was placed on the overlap (knot) area and gentle heating was used to obtain a uniform thin film which coated the fiber’s surface. Upon irradiation with UV light, noticeable changes to the peak resonance wavelengths were observed which we associate with a local change in the refractive index (RI) in the fiber’s tapering area. Repeatable and reversible spectral shifting (0.15 nm) of the resonance wavelength is demonstrated by irradiation with 50 mW/cm2 UV light.

© 2011 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(230.1150) Optical devices : All-optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

Original Manuscript: May 11, 2011
Revised Manuscript: June 18, 2011
Manuscript Accepted: June 22, 2011
Published: July 11, 2011

Zhe Chen, Vincent K. S. Hsiao, Xiaoqing Li, Zhen Li, Jianhui Yu, and Jun Zhang, "Optically tunable microfiber-knot resonator," Opt. Express 19, 14217-14222 (2011)

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