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Optical Engineering

Refractometer based on a microslot in single-multi-single fiber fabricated by femtosecond laser
Author(s): Guilin Zhang; Minghong Yang; Min Wang; Dongwen Li; Xingang Wang
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Paper Abstract

We propose and investigate a refractive index (RI) sensor consisting of a combination of single-multi-single mode fiber and a microslot structure in the multimode fiber fabricated by femtosecond laser as the sensing head. The beam propagation method is utilized to simulate the microslot structure. Simulation results show the size of the microslot significantly influences the RI sensitivity. At an ablation depth of 170 μm and a width of 30 μm, the refractometer shows a high sensitivity of 1327.27 nm per RI unit (RIU) and a better stability in the RI range of 1.33 to 1.35. Moreover, higher sensitivity in a narrow RI range can be achieved by optimizing the microslot structure. Experimental investigations demonstrated a sensitivity of 912.31  nm/RIU for an RI range of 1.33 to 1.35 for a refractometer with a microslot depth of 170 μm and width of 24 μm, which is essentially in agreement with the simulated results.

Paper Details

Date Published: 3 April 2013
PDF: 6 pages
Opt. Eng. 52(4) 044401 doi: 10.1117/1.OE.52.4.044401
Published in: Optical Engineering Volume 52, Issue 4
Show Author Affiliations
Guilin Zhang, Wuhan Univ. of Technology (China)
Minghong Yang, Wuhan Univ. of Technology (China)
Min Wang, Wuhan Univ. of Technology (China)
Dongwen Li, Wuhan Univ. of Technology (China)
Xingang Wang, Chongqing Univ. (China)

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