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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 27039–27044

High-Q width modulated photonic crystal stack mode-gap cavity and its application to refractive index sensing

Kaiyuan Yao and Yaocheng Shi  »View Author Affiliations

Optics Express, Vol. 20, Issue 24, pp. 27039-27044 (2012)

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An optical sensor based on One-Dimensional photonic crystal (1D PhC) stack mode-gap cavity has been designed, fabricated and characterized. By introducing quadratically modulated width tapering structure, a waveguide coupled 1D PhC stack mode-gap cavity with calculated Q-factor 1.74 × 107 and an effective mode volume 1.48(λ/nSi)3 has been designed. This cavity has been used for sensing applications by immersing into water-ethanol mixture of different volume concentrations. Transmission measurement shows a quality factor as high as 27, 000 can be achieved for the cavity immersed in analytes. A sensitivity of 269nm/RIU has been demonstrated.

© 2012 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(230.5298) Optical devices : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: August 28, 2012
Revised Manuscript: November 10, 2012
Manuscript Accepted: November 10, 2012
Published: November 15, 2012

Kaiyuan Yao and Yaocheng Shi, "High-Q width modulated photonic crystal stack mode-gap cavity and its application to refractive index sensing," Opt. Express 20, 27039-27044 (2012)

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