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Article

Optical Fiber-Tip Sensors Based on In-Situ µ-Printed Polymer Suspended-Microbeams

1
Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong, China
2
Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(6), 1825; https://doi.org/10.3390/s18061825
Received: 17 April 2018 / Revised: 26 May 2018 / Accepted: 1 June 2018 / Published: 5 June 2018
Miniature optical fiber-tip sensors based on directly µ-printed polymer suspended-microbeams are presented. With an in-house optical 3D μ-printing technology, SU-8 suspended-microbeams are fabricated in situ to form Fabry–Pérot (FP) micro-interferometers on the end face of standard single-mode optical fiber. Optical reflection spectra of the fabricated FP micro-interferometers are measured and fast Fourier transform is applied to analyze the cavity of micro-interferometers. The applications of the optical fiber-tip sensors for refractive index (RI) sensing and pressure sensing, which showed 917.3 nm/RIU to RI change and 4.29 nm/MPa to pressure change, respectively, are demonstrated in the experiments. The sensors and their optical µ-printing method unveil a new strategy to integrate complicated microcomponents on optical fibers toward ‘lab-on-fiber’ devices and applications. View Full-Text
Keywords: optical fiber-tip sensors; optical 3D µ-printing; refractive index sensors; gas-pressure sensors; lab-on-fiber optical fiber-tip sensors; optical 3D µ-printing; refractive index sensors; gas-pressure sensors; lab-on-fiber
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MDPI and ACS Style

Yao, M.; Ouyang, X.; Wu, J.; Zhang, A.P.; Tam, H.-Y.; Wai, P.K.A. Optical Fiber-Tip Sensors Based on In-Situ µ-Printed Polymer Suspended-Microbeams. Sensors 2018, 18, 1825. https://doi.org/10.3390/s18061825

AMA Style

Yao M, Ouyang X, Wu J, Zhang AP, Tam H-Y, Wai PKA. Optical Fiber-Tip Sensors Based on In-Situ µ-Printed Polymer Suspended-Microbeams. Sensors. 2018; 18(6):1825. https://doi.org/10.3390/s18061825

Chicago/Turabian Style

Yao, Mian, Xia Ouyang, Jushuai Wu, A. P. Zhang, Hwa-Yaw Tam, and P. K.A. Wai. 2018. "Optical Fiber-Tip Sensors Based on In-Situ µ-Printed Polymer Suspended-Microbeams" Sensors 18, no. 6: 1825. https://doi.org/10.3390/s18061825

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