Temat: refractive index sensing

Skocz do pozycji: 1.

Tytuł:: Colloidal crystal cladded microfiber for refractive index sensing
Autorzy:: Yan, H. T.
Zhao, X Y
Zhang, Ch.
Zhen, Z Q
Li, Q Z
Cao, J X
Xia, L X
Tematy:: microfibers
colloidal crystals
refractive index sensing; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174902.pdf Link otwiera się w nowym oknie
Opis:: We investigate the evanescent field of a microfiber wrapped by colloidal crystals. The microfiber has the diameter of about 1 μm that is drawn from a single-mode fiber with an alcohol lamp. The colloidal spheres are further attached to the microfiber through thermal evaporation, then they self-assemble to crystal-like structures. The 400 nm, 590 nm, and 710 nm-diameter SiO2 colloidal spheres are used, respectively. The spectral responses are studied theoretically and experimentally, and the results agree with each other. It is revealed that the evanescent field of a microfiber could be modulated by the photonic band-gap of colloidal crystals. This characteristic is very useful in refractive index sensing for liquids.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A microfluidic system for analysis of electrochemical processing using a highly sensitive optical fiber microcavity
Autorzy:: Śmietana, Mateusz
Janik, Monika
Krześniak, Andrzej
Koba, Marcin
Gabler, Tomasz
Jönsson-Niedziółka, Martin
Wydawca:: Elsevier
Cytata wydawnicza:: Optics and Lasers in Engineering 158 (2022) 107173. https://doi.org/10.1016/j.optlaseng.2022.107173
Opis:: National Science Centre Poland (NCN), NCN 2018/29/B/ST7/02552
Microfluidics provide unique possibilities to control tiny volumes of liquids and their composition. In this work we combined a microfluidic system with a microcavity in-line Mach-Zehnder interferometer (μIMZI) induced in the side surface of a single-mode optical fiber using a femtosecond laser micromachining. The μIMZI shows capability for investigating optical properties of volumes down to picoliters with an exceptionally high refractive index sensitivity. Here we report numerical analysis and experimental results that show that when the μIMZI is incorporated with the microfluidic system the measurements can be performed with sensitivity exceeding 14,000 nm/RIU which is similar to measurements done under static conditions. In a flow injection system, we show the influence of flow rate and injection volume on the response, and that the orientation of the cavity versus the flow direction has only a minor impact on the results. Finally, we have supported the system by band electrodes making it possible to induce redox reactions in the microchannel to detect the flowing products of the reactions optically. It has been found that thanks to the high sensitivity of the μIMZI the products of the reactions can be clearly detected both electrochemically and optically even when the only part of the flowing redox probe is oxidized at the band electrode. The capability for monitoring the products was shown for a standard redox probe, potassium ferricyanide, as well as for the neurotransmitter dopamine. This work shows that the proposed solution may offer highly sensitive optical measurements, even when the chemical reactions are not effective in the whole volume of the system.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of liquids with microcavity in-line Mach-Zehnder interferometers – impact of the microcavity shape on the sensing performance
Autorzy:: Śmietana, Mateusz
Wang, Ying
Janik, Monika
Koba, Marcin
Liao, Changrui
Myśliwiec, Anna
Gabler, Tomasz
Jönsson-Niedziółka, Martin
Wydawca:: Elsevier
Cytata wydawnicza:: Optical Fiber Technology 73 (2022) 103059. https://doi.org/10.1016/j.yofte.2022.103059
Opis:: In this work, we review microcavity in-line Mach-Zehnder Interferometers (µIMZI) obtained in optical fibers using femtosecond (fs) laser micromachining. These structures can be considered as a great solution satisfying the requirements mentioned above for small-volume RI sensing applicable in label-free biosensing. Furthermore, application of the femtosecond laser facilitates tailoring of the microcavity’s shape with high degree of flexibility. Over the years, various µIMZI have been reported, where RI sensing has been mainly analyzed but no impact of the microcavity shape has been shown up to date. Thus, on top of the review on µIMZIs, in this work, we discuss the impact of the shape of the on the sensing performance of the device. We use two representative examples of microcavity shapes, i.e., U-shape and V-trench, made in a standard single-mode fiber. Despite different shapes, both structures offer similar and high RI sensitivity (exceeding 13,000 nm/RIU in the RI range 1.333–1.340 RIU). However, the performance of the structures in microfluidic systems is different. Based on the experimental results and numerical simulations, the advantages and disadvantages of different shapes are discussed for their application in investigations of liquids and biosensing.
This work was supported by the National Science Centre (NCN), Poland, under grant No. 2018/29/B/ST7/02552 and the internal grant of Warsaw University of Technology (Poland) supporting scientific activity in Automatics, Electronics and Electrotechnics received in 2020. M. Janik acknowledges the support from the Foundation for Polish Science within the START 2021 program.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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