Microfiber sensor probe integrated with a cascaded Fabry–Perot interferometer

Developing micrometer-nanometer size optical fiber sensors has promising application prospects in microenvironments, such as biological cells, micro robots, and microfluids. We propose a new strategy to fabricate a microfiber sensor probe (MSP). A femtosecond laser was applied to integrate cascaded...

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Bibliographic Details
Published in:Applied optics (2004) 2021-09, Vol.60 (27), p.8226
Main Authors: Chen, Qi, Gao, Feng, Wang, Zhaokun, Wang, Hailong, Wang, D. N., Zhou, Shenghua, Pan, Guiming
Format: Article
Language:English
Subjects:
Diameters
Fabry-Perot interferometers
Microfibers
Microrobots
Optical fibers
Refractivity
Sensitivity
Silicon dioxide
Thermal measurement
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Summary:Developing micrometer-nanometer size optical fiber sensors has promising application prospects in microenvironments, such as biological cells, micro robots, and microfluids. We propose a new strategy to fabricate a microfiber sensor probe (MSP). A femtosecond laser was applied to integrate cascaded Fabry–Perot interferometers (FPIs) into a silica microfiber. And a MSP with diameter of ∼ 8 µ m , extinction ratio of 15 dB, fitness of 24.6, and Q-factor of 2310 was demonstrated in the experiment. In addition, the MSP was applied for the refractive index and thermal measurement and the sensitivity was observed to be 10 pm/°C and 18.5 nm/RIU. The two-beam approximation model was applied to analyze the spectrum, and simulations were taken to research the refractive index sensitivity influenced by the fiber size.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.434019