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Title: Combined microfiber knot resonator and focused ion beam-milled Mach-Zehnder interferometer for refractive index measurement
Authors: André Delgado Gomes
Warren Smith,SC
Issue Date: 2017
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. © 2017 SPIE.
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