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Proceedings Paper

Combined microfiber knot resonator and focused ion beam-milled Mach-Zehnder interferometer for refractive index measurement
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Paper Abstract

A Mach-Zehnder interferometer was created from a cavity milled in the taper region next to a microfiber knot resonator. A focused ion beam was used to mill the cavity with 47.8 μm in length. The microfiber knot resonator was created from an 11 μm diameter taper, produced using a filament fusion splicer. After milling the cavity, the microfiber knot resonator spectrum is still visible. The final response of the presented sensor is a microfiber knot resonator spectrum modulated by the Mach-Zehnder interference spectrum. A preliminary result of -8935 ± 108 nm/RIU was obtained for the refractive index sensitivity of the cavity component in a refractive index range of n = 1.333 to 1.341. Simultaneous measurement of refractive index and temperature using this combined structure is a future goal.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032340 (23 April 2017); doi: 10.1117/12.2265387
Show Author Affiliations
André D. Gomes, INESC TEC (Portugal)
Univ. of Porto (Portugal)
Leibniz Institute of Photonic Technology (Germany)
Ricardo M. André, INESC TEC (Portugal)
Univ. of Porto (Portugal)
Leibniz Institute of Photonic Technology (Germany)
Stephen C. Warren-Smith, Leibniz Institute of Photonic Technology (Germany)
Jan Dellith, Leibniz Institute of Photonic Technology (Germany)
Martin Becker, Leibniz Institute of Photonic Technology (Germany)
Manfred Rothhardt, Leibniz Institute of Photonic Technology (Germany)
Orlando Frazão, INESC TEC (Portugal)
Univ. of Porto (Portugal)


Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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