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

Mian Yao, Xia Ouyang, Jushuai Wu, A. Ping Zhang*, Hwa-Yaw Tam, Alex Wai

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

25 Citations (Scopus)


Miniature optical fiber-tip sensors based on directly μ-printed polymer suspended-microbea ms 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.

Original languageEnglish
Article number1825
Number of pages10
Issue number6
Publication statusPublished - Jun 2018

Scopus Subject Areas

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

User-Defined Keywords

  • optical fiber-tip sensors
  • optical 3D µ-printing
  • refractive index sensors
  • gas-pressure sensors
  • lab-on-fiber


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