Inline core-cladding intermodal interferometer based on nano-coated photonic crystal fiber for refractive-index sensing

Mateusz Smietana; Daniel Brabant; Wojtek J. Bock; Predrag Mikulic; Tinko Eftimov

doi:10.1117/12.885925

17 May 2011 Inline core-cladding intermodal interferometer based on nano-coated photonic crystal fiber for refractive-index sensing

Mateusz Smietana, Daniel Brabant, Wojtek J. Bock, Predrag Mikulic, Tinko Eftimov

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77531R (2011) https://doi.org/10.1117/12.885925
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

The paper presents a modification of the refractive-index (RI) response of a photonic crystal fiber (PCF) based intermodal interferometer using a thin plasma-deposited silicon nitride (SiN_x) overlay with a high refractive index. We show that the film overlay can effectively change the distribution of the cladding modes and thus tune the RI sensitivity of the interferometer. Thanks to the nano-coating we were able to increase RI sensitivity eightfold in the range required for biosensors (nD~1.33). Due to the extreme hardness of SiN_x films and their excellent adhesion to the fiber surface, we believe that after the deposition the device can still maintain its advantages, i.e. lack of degradation over time or with temperature.

Citation Download Citation

Mateusz Smietana, Daniel Brabant, Wojtek J. Bock, Predrag Mikulic, and Tinko Eftimov "Inline core-cladding intermodal interferometer based on nano-coated photonic crystal fiber for refractive-index sensing", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77531R (17 May 2011); https://doi.org/10.1117/12.885925

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