Ultra-small Fabry-Perot cavities in tapered optical fibers
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(Published version)
Date
2016
Authors
Warren-Smith, S.
André, R.
Dellith, J.
Bartelt, H.
Editors
Hutchinson, M.
Goldys, E.
Goldys, E.
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Conference paper
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Proceedings of SPIE, 2016 / Hutchinson, M., Goldys, E. (ed./s), vol.10013, pp.1-3
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SPIE BioPhotonics Australasia Conference (17 Oct 2016 - 19 Oct 2016 : Adelaide, AUSTRALIA)
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.
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Copyright 2016 SPIE