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Proceedings Paper

Ultra-small Fabry-Perot cavities in tapered optical fibers
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Paper Abstract

The small dimensions of optical fiber sensors are of interest to biological applications, given the ability to penetrate relatively inaccessible regions. However, conventional optical fibers are larger than biological material such as cells, and thus there is a need for further miniaturization. Here we present the fabrication of ultra-small Fabry-Perot cavities written into optical micro-fibers using focused ion beam (FIB) milling. We have fabricated cavities as small as 2.8 μm and demonstrated their use for measuring refractive index. In order to achieve sensitive measurements we interrogate at visible wavelengths, thereby reducing the free spectral range of the interferometer (relative to infra-red interrogation), increasing the number of interference fringes, and allowing for the implementation of the Fourier shift method.

Paper Details

Date Published: 24 November 2016
PDF: 3 pages
Proc. SPIE 10013, SPIE BioPhotonics Australasia, 100131A (24 November 2016); doi: 10.1117/12.2243631
Show Author Affiliations
Stephen C. Warren-Smith, Leibniz Institute of Photonic Technology (Germany)
Ricardo M. André, Leibniz Institute of Photonic Technology (Portugal)
Univ. of Porto (Portugal)
Jan Dellith, Leibniz Institute of Photonic Technology (Germany)
Hartmut Bartelt, Leibniz Institute of Photonic Technology (Germany)

Published in SPIE Proceedings Vol. 10013:
SPIE BioPhotonics Australasia
Mark R. Hutchinson; Ewa M. Goldys, Editor(s)

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