Optical fiber-tip sensors based on in-situ μ-printed polymer suspended-microbeams

Mian Yao, Xia Ouyang, Jushuai Wu, Aping Zhang, Hwa Yaw Tam, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-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
JournalSensors (Switzerland)
Issue number6
Publication statusPublished - 5 Jun 2018


  • Gas-pressure sensors
  • Lab-on-fiber
  • Optical 3D μ-printing
  • Optical fiber-tip sensors
  • Refractive index sensors

ASJC Scopus subject areas

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


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