Tailoring Properties of Microcavity In-line Mach-Zehnder Interferometer by the Microcavity Enlargement using Femtosecond Laser
Monika Janik , Tinko Eftimov , Marcin Koba , Mateusz Jakub Śmietana , Wojtek J. Bock
AbstractThis work presents a theoretical analysis and experimental verification of fine-tuning of the spectral response and refractive index (RI) sensitivity of microcavity in-line Mach-Zehnder interferometer (μIMZI). The μIMZIs were fabricated using femtosecond (fs) laser micromachining in standard single-mode fibers as circular cavities with a diameter of 60 μm. Next, the structures underwent fs laser post-processing, which included fabrication of an additional cavity with the same diameter but shifted by 15 μm or 30 μm against the center of the initial microcavity. Different depths of the additional structures were investigated. The enlargement of the microcavity allows for tailoring the spectral response, i.e., it shifts the interference pattern by more than 200 nm, with no introduction of any additional losses and distortions in the spectrum. As the additional effect, regardless of the size of the extension, the sensitivity of the enlarged μIMZI was improved by 32%.
|Journal series||Journal of Lightwave Technology, ISSN 0733-8724|
|No||26 March 2019|
|Publication size in sheets||0.5|
|Keywords in English||Fiber optics sensors, Interferometry, Laser materials processing, Microstructure fabrication, Microcavities|
|Score||= 140.0, 11-02-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2018 = 1.923; : 2018 = 4.162 (2) - 2018=3.673 (5)|
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