Combined Long-Period Fiber Grating and Microcavity In-Line Mach–Zehnder Interferometer for Refractive Index Measurements with Limited Cross-Sensitivity

Monika Janik , Marcin Koba , Krystian Bogumił Król , Predrag Mikulic , Wojtek J. Bock , Mateusz Jakub Śmietana


This work discusses sensing properties of a long-period grating (LPG) and microcavity in-line Mach–Zehnder interferometer (µIMZI) when both are induced in the same single-mode optical fiber. LPGs were either etched or nanocoated with aluminum oxide (Al2O3) to increase its refractive index (RI) sensitivity up to ≈2000 and 9000 nm/RIU, respectively. The µIMZI was machined using a femtosecond laser as a cylindrical cavity (d = 60 μm) in the center of the LPG. In transmission measurements for various RI in the cavity and around the LPG we observed two effects coming from the two independently working sensors. This dual operation had no significant impact on either of the devices in terms of their functional properties, especially in a lower RI range. Moreover, due to the properties of combined sensors two major effects can be distinguished—sensitivity to the RI of the volume and sensitivity to the RI at the surface. Considering also the negligible temperature sensitivity of the µIMZI, it makes the combination of LPG and µIMZI sensors a promising approach to limit cross-sensitivity or tackle simultaneous measurements of multiple effects with high efficiency and reliability.
Author Monika Janik
Monika Janik,,
, Marcin Koba
Marcin Koba,,
, Krystian Bogumił Król (FEIT / MO)
Krystian Bogumił Król,,
- The Institute of Microelectronics and Optoelectronics
, Predrag Mikulic
Predrag Mikulic,,
, Wojtek J. Bock
Wojtek J. Bock,,
, Mateusz Jakub Śmietana (FEIT / MO)
Mateusz Jakub Śmietana,,
- The Institute of Microelectronics and Optoelectronics
Journal seriesSensors, [SENSORS-BASEL], ISSN 1424-8220, e-ISSN 1424-3210
Issue year2020
Article number2431
ASJC Classification1303 Biochemistry; 1602 Analytical Chemistry; 2208 Electrical and Electronic Engineering; 3107 Atomic and Molecular Physics, and Optics
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 14-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.393; WoS Impact Factor: 2018 = 3.031 (2) - 2018=3.302 (5)
Citation count*1 (2020-09-22)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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