Increased sensitivity of femtosecond laser micro-machined in-fiber Mach-Zehnder interferometer for small-scale refractive index sensing

Anna K. Dębowska; Marcin Koba; Monika Janik; Wojtek J. Bock; Mateusz Śmietana

doi:10.1117/12.2236899

30 May 2016 Increased sensitivity of femtosecond laser micro-machined in-fiber Mach-Zehnder interferometer for small-scale refractive index sensing

Anna K. Dębowska, Marcin Koba, Monika Janik, Wojtek J. Bock, Mateusz Śmietana

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99160Q (2016) https://doi.org/10.1117/12.2236899
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

In this paper we focus on refractive index (RI) sensing properties of a micro-size In-fiber Mach-Zehnder Interferometer (μIMZI). The μIMZI structure was fabricated as a precisely controlled side opening of a single-mode fiber using a femtosecond laser. The sensitivity to RI change in the micro-cavity has been measured and two RI sensitivity regions have been found for RI 1.33-1.36 and 1.37-1.40 RIU. The sensitivity in the first region is over 12,000 nm/RIU, and in the higher RI region is close to 50% higher. The obtained structures are an excellent solution for RI sensing with negligible temperature cross-sensitivity, especially where small amounts of liquid are available, e.g. in lab-on-chip, microfluidics.

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Anna K. Dębowska, Marcin Koba, Monika Janik, Wojtek J. Bock, and Mateusz Śmietana "Increased sensitivity of femtosecond laser micro-machined in-fiber Mach-Zehnder interferometer for small-scale refractive index sensing", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160Q (30 May 2016); https://doi.org/10.1117/12.2236899

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