Affiliation:
1. Chongqing Three Gorges University
2. Chongqing Key Laboratory of Development and Utilization of Genuine Medicinal Materials in Three Gorges Reservoir Area
Abstract
A fiber surface plasmon resonance (SPR) sensor is widely used in high-sensitivity
refractive index measurement, but there is less research on curvature
measurement. In this paper, a single-mode fiber curvature sensor based
on SPR is designed and fabricated. By employing bending, the
transmitted light in the fiber core leaks into the cladding. A 50 nm
gold film is coated outside the cladding, and the evanescent field of
the cladding after bending contacts the gold film to cause SPR. When
the curvature changes, the coupled cladding mode and intensity are
different; that is, the SPR incident angle and evanescent field
intensity are different, so as to realize the dual parameters of SPR
resonance wavelength and depth of the resonance valley changing with
curvature. By experiments, the influence of different cutoff
wavelengths of single-mode fiber on the performance of the sensor is
studied. The testing results indicate that with the decrease in cutoff
wavelength of the single-mode fiber, the valley depth sensitivity of
the sensor increases, and the half height width (FWHM) decreases. When
the cutoff wavelength of the single-mode fiber is 630 nm, the valley
depth sensitivity of the sensor is
0.0088
a
.
u
/
m
−
1
, the wavelength sensitivity is
0.26
n
m
/
m
−
1
, and the average FWHM is only 21 nm.
The proposed single-mode fiber curvature sensor based on SPR has a
narrow FWHM and an opening threshold. It can also realize no opening
threshold by introducing a coreless fiber, which provides a new
solution, to the best of our knowledge, for the diversified detection
of fiber SPR sensors.
Funder
Fundamental Research Funds for Chongqing Three Gorges University of China
Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-Warning in Three Gorges Reservoir Area
Science and Technology Project Affiliated to the Education Department of Chongqing Municipality
Chongqing Natural Science Foundation
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
13 articles.
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