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

André D. Gomes; Ricardo M. André; Stephen C. Warren-Smith; Jan Dellith; Martin Becker; Manfred Rothhardt; Orlando Frazão

doi:10.1117/12.2265387

23 April 2017 Combined microfiber knot resonator and focused ion beam-milled Mach-Zehnder interferometer for refractive index measurement

André D. Gomes, Ricardo M. André, Stephen C. Warren-Smith, Jan Dellith, Martin Becker, Manfred Rothhardt, Orlando Frazão

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 1032340 (2017) https://doi.org/10.1117/12.2265387
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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.

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André D. Gomes, Ricardo M. André, Stephen C. Warren-Smith, Jan Dellith, Martin Becker, Manfred Rothhardt, and Orlando Frazão "Combined microfiber knot resonator and focused ion beam-milled Mach-Zehnder interferometer for refractive index measurement", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032340 (23 April 2017); https://doi.org/10.1117/12.2265387

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