22 February 2018 Near infrared operation of femtosecond laser micro-machined in-fiber Mach Zehnder interferometers for refractive index sensing
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Abstract
This paper discusses refractive index (n) measurement capabilities of interferometers based on micro-cavities of various diameters (d = 50 and 60 μm) fabricated in optical fibers by a femtosecond laser. In comparison to previously presented structures, the reported sensor operates in the near-infrared spectral range. Bottom of the cavity intersected the fiber’s core (5.2 μm in diameter), which induced the Mach-Zehnder interferometer effect. After filling the cavity, a set of minima can be observed in the transmission spectrum, and they shift in wavelength with a change in n. The fabricated sensors exhibit high and linear sensitivity and can measure sub-nanoliter volumes of liquids, what make this sensor perfect for various diagnostic medical or biochemical applications.
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Monika Janik, Monika Janik, Tinko Eftimov, Tinko Eftimov, Marcin Koba, Marcin Koba, Mateusz Śmietana, Mateusz Śmietana, Wojtek J. Bock, Wojtek J. Bock, } "Near infrared operation of femtosecond laser micro-machined in-fiber Mach Zehnder interferometers for refractive index sensing", Proc. SPIE 10544, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XI, 105440F (22 February 2018); doi: 10.1117/12.2291120; https://doi.org/10.1117/12.2291120
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