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


This 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%.
Author Monika Janik
Monika Janik,,
, Tinko Eftimov
Tinko Eftimov,,
, Marcin Koba
Marcin Koba,,
, Mateusz Jakub Śmietana (FEIT / MO)
Mateusz Jakub Śmietana,,
- The Institute of Microelectronics and Optoelectronics
, Wojtek J. Bock
Wojtek J. Bock,,
Journal seriesJournal of Lightwave Technology, ISSN 0733-8724, e-ISSN 1558-2213
Issue year2019
Publication size in sheets0.5
Article number8674552
Keywords in EnglishFiber optics sensors, Interferometry, Laser materials processing, Microstructure fabrication, Microcavities
ASJC Classification3107 Atomic and Molecular Physics, and Optics
URL https://ieeexplore.ieee.org/document/8674552
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 24-06-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.923; WoS Impact Factor: 2018 = 4.162 (2) - 2018=3.673 (5)
Citation count*2 (2020-07-15)
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