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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25858–25866

Optics InfoBase > Optics Express > Volume 20 > Issue 23 > Page 25858

Coexistence of positive and negative refractive index sensitivity in the liquid-core photonic crystal fiber based plasmonic sensor

Binbin Shuai, Li Xia, and Deming Liu  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 25858-25866 (2012)
http://dx.doi.org/10.1364/OE.20.025858


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Abstract

We present and numerically characterize a liquid-core photonic crystal fiber based plasmonic sensor. The coupling properties and sensing performance are investigated by the finite element method. It is found that not only the plasmonic mode dispersion relation but also the fundamental mode dispersion relation is rather sensitive to the analyte refractive index (RI). The positive and negative RI sensitivity coexist in the proposed design. It features a positive RI sensitivity when the increment of the SPP mode effective index is larger than that of the fundamental mode, but the sensor shows a negative RI sensitivity once the increment of the fundamental mode gets larger. A maximum negative RI sensitivity of −5500nm/RIU (Refractive Index Unit) is achieved in the sensing range of 1.50-1.53. The effects of the structural parameters on the plasmonic excitations are also studied, with a view of tuning and optimizing the resonant spectrum.

© 2012 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Sensors

History
Original Manuscript: July 16, 2012
Revised Manuscript: August 23, 2012
Manuscript Accepted: August 27, 2012
Published: November 1, 2012

Citation
Binbin Shuai, Li Xia, and Deming Liu, "Coexistence of positive and negative refractive index sensitivity in the liquid-core photonic crystal fiber based plasmonic sensor," Opt. Express 20, 25858-25866 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-25858


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