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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26908–26913

Slotted photonic crystal nanobeam cavity with parabolic modulated width stack for refractive index sensing

Peipeng Xu, Kaiyuan Yao, Jiajiu Zheng, Xiaowei Guan, and Yaocheng Shi  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 26908-26913 (2013)

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We present the design, fabrication, and the characterization of high-Q slotted 1D photonic crystal (PhC) cavities with parabolic-width stack. Their peculiar geometry enables the location of the resonating mode close to the air-band. The majority of optical field distributes in the slotted low-index area and the light matter interaction with the analytes has been enhanced. Cavities with measured Q-factors ~104 have been demonstrated. The refractive index sensing measurement for NaCl solutions with different concentrations shows a sensitivity around 410. Both the achieved Q-factor and the sensitivity are higher than the one reported recently by using 2D slotted PhC cavities. The total size for the sensing part of the present device is reduced to 16.8 × 2.5 μm2.

© 2013 Optical Society of America

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: September 5, 2013
Revised Manuscript: October 24, 2013
Manuscript Accepted: October 24, 2013
Published: October 30, 2013

Peipeng Xu, Kaiyuan Yao, Jiajiu Zheng, Xiaowei Guan, and Yaocheng Shi, "Slotted photonic crystal nanobeam cavity with parabolic modulated width stack for refractive index sensing," Opt. Express 21, 26908-26913 (2013)

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