Ultra-small Fabry-Perot cavities in tapered optical fibers

Stephen C. Warren-Smith; Ricardo M. André; Jan Dellith; Hartmut Bartelt

doi:10.1117/12.2243631

24 November 2016 Ultra-small Fabry-Perot cavities in tapered optical fibers

Stephen C. Warren-Smith, Ricardo M. André, Jan Dellith, Hartmut Bartelt

Proceedings Volume 10013, SPIE BioPhotonics Australasia; 100131A (2016) https://doi.org/10.1117/12.2243631
Event: SPIE BioPhotonics Australasia, 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.

Citation Download Citation

Stephen C. Warren-Smith, Ricardo M. André, Jan Dellith, and Hartmut Bartelt "Ultra-small Fabry-Perot cavities in tapered optical fibers", Proc. SPIE 10013, SPIE BioPhotonics Australasia, 100131A (24 November 2016); https://doi.org/10.1117/12.2243631

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