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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 8 — Aug. 1, 2014
  • pp: 1746–1752

Refractive index sensing utilizing parallel tapered nano-slotted photonic crystal nano-beam cavities

Jian Zhou, Huiping Tian, Daquan Yang, Qi Liu, Lijun Huang, and Yuefeng Ji  »View Author Affiliations

JOSA B, Vol. 31, Issue 8, pp. 1746-1752 (2014)

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We demonstrate refractive index sensing using parallel tapered nano-slotted photonic-crystal nano-beam cavities with three-dimensional (3D) finite-difference time-domain (3D-FDTD) simulation. The electric field of the cavity mode is strongly concentrated in the slot region leading to a large light–matter overlap, which is expected to add a significant contribution to sensitivity, and thus we present high refractive-index sensitivity of more than 600nm/refractive index units. Additionally, the quality (Q)-factor in the proposed design is theoretically investigated, and through tapering the diameter of the pores outside the Bragg mirrors in nano-beam cavities and the width of the adjacent nano-slots, an optimal Q-factor of 11770 is obtained. A high figure of merit (FOM=4637) of the designed model has been obtained. We anticipate that this geometry is potentially an ideal platform for refractive-index based bio-sensing.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(230.5298) Optical devices : Photonic crystals

ToC Category:
Optical Devices

Original Manuscript: March 31, 2014
Revised Manuscript: May 28, 2014
Manuscript Accepted: June 5, 2014
Published: July 3, 2014

Virtual Issues
Vol. 9, Iss. 10 Virtual Journal for Biomedical Optics

Jian Zhou, Huiping Tian, Daquan Yang, Qi Liu, Lijun Huang, and Yuefeng Ji, "Refractive index sensing utilizing parallel tapered nano-slotted photonic crystal nano-beam cavities," J. Opt. Soc. Am. B 31, 1746-1752 (2014)

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