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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17591–17598

Femtosecond laser fabricated all-optical fiber sensors with ultrahigh refractive index sensitivity: modeling and experiment

Lan Jiang, Longjiang Zhao, Sumei Wang, Jinpeng Yang, and Hai Xiao  »View Author Affiliations

Optics Express, Vol. 19, Issue 18, pp. 17591-17598 (2011)

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All-optical fiber sensors based on ultracompact fiber inline Mach-Zehnder interferometer (MZI) are fabricated by side-ablating a U-shape microcavity in a single-mode optical fiber with the fiber core partially removed using femtosecond (fs) laser pulses, in which the two light paths are accordingly formed in the remaining D-type fiber core and the U-shape microcavity. Beam propagation method (BPM) analysis is utilized to illustrate the dependences of good transmission spectra on parameters including the ablation depth, ablation length and the refractive index of U-shape micocavity, which gives some guidelines to optimize parameters for fs laser micromachining and predicts RI (refractive index) sensitivities within given RI ranges. The modeling results of ultrahigh RI sensitivities for gases and solutions are −3243.75 ± 0.65nm/RIU (refractive index unit) and −10789.29 ± 18.91nm/RIU, respectively. In RI testing experiments, the sensor exhibits ultrahigh RI sensitivities of −3754.79 ± 44.24nm/RIU with refractive indices ranging from 1.0001143 to 1.0002187 by testing different mixture ratios of N2 and He gases, and −12162.01 ± 173.92nm/RIU with refractive indices ranging from 1.3330 to 1.33801 by testing different concentrations of sucrose solutions, which is essentially in agreement with the modeling results.

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OCIS Codes
(000.4430) General : Numerical approximation and analysis
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.7090) Lasers and laser optics : Ultrafast lasers
(230.4000) Optical devices : Microstructure fabrication

ToC Category:

Original Manuscript: April 14, 2011
Revised Manuscript: July 5, 2011
Manuscript Accepted: July 6, 2011
Published: August 23, 2011

Lan Jiang, Longjiang Zhao, Sumei Wang, Jinpeng Yang, and Hai Xiao, "Femtosecond laser fabricated all-optical fiber sensors with ultrahigh refractive index sensitivity: modeling and experiment," Opt. Express 19, 17591-17598 (2011)

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