Novel diaphragm microfabrication techniques for high-sensitivity biomedical fiber optic Fabry-Perot interferometric sensors

Sven Poeggel, Daniele Tosi, Dineshbabu Duraibabu, James Kelly, Maria Munroe, Gabriel Leen, Elfed Lewis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


In this paper new algorithms and procedures are reported which enable miniaturization and optimization of the thickness of a diaphragm for an all-glass extrinsic Fabry-Perot interferometer (EFPI)-based pressure sensor. Diaphragm etching improves the EFPI sensors ability to detect relatively small changes in pressure (0.1mmHg) and the resulting sensor exhibits excellent stability over time (drift < 1 mmHg / hour) for measurement in air and liquid. The diaphragm etching procedure involves fiber polishing followed by etching in hydrofluoric (HF) acid. An additional Ion-beam etching technique was investigated separately to compare with the HF-etching technique. A sensitivity better than 10 10 nm/kPa, which provides a pressure resolution of 0.05mmHg, is achieved by reducing the EFPI diaphragm thickness down to less than 2μm for the miniature pressure sensor used in this investigation (overall diameter of 200μm). The techniques reported is also applicable for the fabrication of high sensitivity sensors using a smaller fiber diameter e.g. 80μm.

Original languageEnglish
Title of host publicationFiber Optic Sensors and Applications XI
ISBN (Print)9781628410358
Publication statusPublished - 2014
Externally publishedYes
EventFiber Optic Sensors and Applications XI - Baltimore, MD, United States
Duration: May 8 2014May 9 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherFiber Optic Sensors and Applications XI
Country/TerritoryUnited States
CityBaltimore, MD


  • Fabry Perot Interferometer (FPI)
  • Optical fibre pressure and temperature sensor (OFPTS)
  • all glass
  • biomedical application
  • high sensitivity
  • hydrofluoric (HF) acid

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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