Enhancing the pressure sensitivity of a Fabry–Perot interferometer using a simplified hollow-core photonic crystal fiber with a microchannel

We demonstrate a novel and compact fiber-probe pressure sensor based on a micro-Fabry–Perot interferometer (FPI). The device is fabricated by splicing both ends of a short-section simplified hollow-core photonic crystal fiber (SHC-PCF) with single-mode fibers. Then, a microchannel is drilled by a fe...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2015-09, Vol.120 (3), p.461-467
Main Authors: Yu, Yongqin, Chen, Xue, Huang, Quandong, Du, Chenlin, Ruan, Shuangchen, Wei, Huifeng
Format: Article
Language:English
Subjects:
Crystal fibers
Detection
Devices
Engineering
Interferometers
Lasers
Microchannels
Optical Devices
Optics
Photonic crystals
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Sensors
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Summary:We demonstrate a novel and compact fiber-probe pressure sensor based on a micro-Fabry–Perot interferometer (FPI). The device is fabricated by splicing both ends of a short-section simplified hollow-core photonic crystal fiber (SHC-PCF) with single-mode fibers. Then, a microchannel is drilled by a femtosecond laser micromachining in the SHC-PCF to allow air to diffuse in. The pressure sensing mechanism is based on the dependence of the air refractive index on pressure. We use both theory and experiment to investigate the sensing characteristics. A micro-FPI with a length of 272 μm demonstrates a pressure sensitivity of 4.071 nm/MPa at 1580 nm and a low-temperature sensitivity of 1.1 pm/°C at atmospheric pressure. We further study the temperature cross sensitivity of the sensor under different pressures. The sensor also shows strong stability and good reversibility, and may be potentially used in pressure sensing applications.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-015-6155-4