Tuning refractive index sensing properties of micro-cavity in-line Mach-Zehnder interferometer with plasma etching

Monika Janik; Marcin Koba; Wojtek J. Bock; Mateusz Śmietana

doi:10.1117/12.2265755

23 April 2017 Tuning refractive index sensing properties of micro-cavity in-line Mach-Zehnder interferometer with plasma etching

Monika Janik, Marcin Koba, Wojtek J. Bock, Mateusz Śmietana

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238M (2017) https://doi.org/10.1117/12.2265755
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

This work presents an application of reactive ion etching (RIE) for an effective tuning of the spectral response and the refractive-index (RI) sensitivity of the micro-cavity in-line Mach-Zehnder interferometer (μIMZI). The μIMZIs were fabricated using femtosecond laser micromachining in a standard single-mode fiber as a form circular holes with a diameter of 54 μm. The application of RIE with SF₆ and O₂ used as reactive gas allows for an efficient and well controlled etching of the fabricated structure. The process resulted in cleaning the bottom of the micro-cavity and smoothening of its sidewalls. In transmission measurements, the effect of the plasma processing was observed as an increase in both spectral depths of the minima and RI sensitivity of the structure, as well as improved wettability of the micro-cavity surface, which made the measurements faster and easier.

Citation Download Citation

Monika Janik, Marcin Koba, Wojtek J. Bock, and Mateusz Śmietana "Tuning refractive index sensing properties of micro-cavity in-line Mach-Zehnder interferometer with plasma etching", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238M (23 April 2017); https://doi.org/10.1117/12.2265755

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