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Dr. Maciej Popenda
Department of Telecommunications and Teleinformatics, Wroclaw University of Science and Technology

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0 optical fiber sensors
0 microstructured fibers
0 hollow-core fibers
0 antiresonant fibers
0 optical fiber design

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antiresonant fibers
optical fiber sensors

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Journal article
Published: 05 March 2021 in Sensors
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Long-period optical fiber gratings (LPGs) are one of the widely used concepts for the sensing of refractive index (RI) changes. Negative curvature hollow-core fibers (NCHCFs), with their relatively large internal diameters that are easy to fill with liquids, appear as a very interesting medium to combine with the idea of LPGs and use for RI sensing. However, to date, there has been no investigation of the RI sensing capabilities of the NCHCF-based LPGs. The results presented in the paper do not only address this matter, but also compare the RI sensitivities of the NCHCFs alone and the gratings. By modeling two revolver-type fibers, with their internal diameters reflecting the results of the possible LPG-inscription process, the authors show that the fibers’ transmission windows shift in response to the RI change, resulting in changes in RI sensitivities as high as −4411 nm/RIU. On the contrary, the shift in the transmission dip of the NCHCF-based LPGs corresponds to a sensitivity of −658 nm/RIU. A general confirmation of these results was ensured by comparing the analytical formulas describing the sensitivities of the NCHCFs and the NCHCF-based LPGs.

ACS Style

Hanna Stawska; Maciej Popenda. Refractive Index Sensors Based on Long-Period Grating in a Negative Curvature Hollow-Core Fiber. Sensors 2021, 21, 1803 .

AMA Style

Hanna Stawska, Maciej Popenda. Refractive Index Sensors Based on Long-Period Grating in a Negative Curvature Hollow-Core Fiber. Sensors. 2021; 21 (5):1803.

Chicago/Turabian Style

Hanna Stawska; Maciej Popenda. 2021. "Refractive Index Sensors Based on Long-Period Grating in a Negative Curvature Hollow-Core Fiber." Sensors 21, no. 5: 1803.

Journal article
Published: 11 June 2020 in Sensors
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Fluorescence anisotropy imaging and sensing is a widely recognized method for studying molecular orientation and mobility. However, introducing this technique to in vivo systems is a challenging task, especially when one considers multiphoton excitation methods. Past two decades have brought a possible solution to this issue in the form of hollow-core antiresonant fibers (HC-ARFs). The continuous development of their fabrication technology has resulted in the appearance of more and more sophisticated structures. One of the most promising concepts concerns dual hollow-core antiresonant fibers (DHC-ARFs), which can be used to split and combine optical signals, effectively working as optical fiber couplers. In this paper, the design of a fluorescence anisotropy sensor based on a DHC-ARF structure is presented. The main purpose of the proposed DHC-ARF is multiphoton-excited fluorescence spectroscopy; however, other applications are also possible.

ACS Style

Hanna Izabela Stawska; Maciej Andrzej Popenda. Fluorescence Anisotropy Sensor Comprising a Dual Hollow-Core Antiresonant Fiber Polarization Beam Splitter. Sensors 2020, 20, 3321 .

AMA Style

Hanna Izabela Stawska, Maciej Andrzej Popenda. Fluorescence Anisotropy Sensor Comprising a Dual Hollow-Core Antiresonant Fiber Polarization Beam Splitter. Sensors. 2020; 20 (11):3321.

Chicago/Turabian Style

Hanna Izabela Stawska; Maciej Andrzej Popenda. 2020. "Fluorescence Anisotropy Sensor Comprising a Dual Hollow-Core Antiresonant Fiber Polarization Beam Splitter." Sensors 20, no. 11: 3321.

Letter
Published: 07 December 2019 in Fibers
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With the growing interest in hollow-core antiresonant fibers (HC-ARF), attributed to the development of their fabrication technology, the appearance of more sophisticated structures is understandable. One of the recently advancing concepts is that of dual hollow-core antiresonant fibers, which have the potential to be used as optical fiber couplers. In the following paper, a design of a dual hollow-core antiresonant fiber (DHC-ARF) acting as a polarization fiber coupler is presented. The structure is based on a highly birefringent hollow-core fiber design, which is proven to be a promising solution for the purpose of propagation of polarized signals. The design of an optimized DHC-ARF with asymmetrical cores is proposed, together with analysis of its essential coupling parameters, such as the extinction ratio, coupling length ratio, and coupling strength. The latter two for the x- and y-polarized signals were ~2 and 1, respectively, while the optical losses were below 0.3 dB/cm in the 1500–1700 nm transmission band.

ACS Style

Hanna Izabela Stawska; Maciej Andrzej Popenda. A Dual Hollow Core Antiresonant Optical Fiber Coupler Based on a Highly Birefringent Structure-Numerical Design and Analysis. Fibers 2019, 7, 109 .

AMA Style

Hanna Izabela Stawska, Maciej Andrzej Popenda. A Dual Hollow Core Antiresonant Optical Fiber Coupler Based on a Highly Birefringent Structure-Numerical Design and Analysis. Fibers. 2019; 7 (12):109.

Chicago/Turabian Style

Hanna Izabela Stawska; Maciej Andrzej Popenda. 2019. "A Dual Hollow Core Antiresonant Optical Fiber Coupler Based on a Highly Birefringent Structure-Numerical Design and Analysis." Fibers 7, no. 12: 109.

Letter
Published: 05 December 2018 in Laser Physics Letters
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In this letter, we propose a single fiber-based sensor setup allowing for simultaneous excitation and detection of multiphoton fluorescence. Presented sensor's key element is the negative curvature hollow core fiber (NCHCF) with three transmission bands in the visible spectral range (414–423 nm, 510–552 nm and 680–784 nm), allowing for nearly dispersion-free guidance of 160 fs-long laser pulses at 730 nm photon wavelength. Total temporal broadening of a laser pulse propagating in the proposed sensor setup is only (7 ± 1) fs. The NCHCF output beam was additionally focused with a microlensed, multimode fiber tip, increasing the efficiency of multiphoton absorption. The usefulness of the sensor for the multiphoton spectroscopy experiments is tested on the solutions of fluorescein and flavin adenine dinucleotide. This optical fiber sensor combines simplicity, minimal size, and good optical properties, and can be found an interesing solution for the non-linear optical methods used in chemistry, biology and medicine.

ACS Style

Maciej Andrzej Popenda; Hanna Izabela Stawska; Marcin Syperek; Alexey F Kosolapov; Anton N Kolyadin; Elżbieta Bereś-Pawlik. Multiphoton fluorescence excitation and detection with a single negative curvature hollow core fibre. Laser Physics Letters 2018, 16, 015103 .

AMA Style

Maciej Andrzej Popenda, Hanna Izabela Stawska, Marcin Syperek, Alexey F Kosolapov, Anton N Kolyadin, Elżbieta Bereś-Pawlik. Multiphoton fluorescence excitation and detection with a single negative curvature hollow core fibre. Laser Physics Letters. 2018; 16 (1):015103.

Chicago/Turabian Style

Maciej Andrzej Popenda; Hanna Izabela Stawska; Marcin Syperek; Alexey F Kosolapov; Anton N Kolyadin; Elżbieta Bereś-Pawlik. 2018. "Multiphoton fluorescence excitation and detection with a single negative curvature hollow core fibre." Laser Physics Letters 16, no. 1: 015103.

Journal article
Published: 11 October 2018 in Fibers
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The presence of fiber optic devices, such as couplers or wavelength division multiplexers, based on hollow-core fibers (HCFs) is still rather uncommon, while such devices can be imagined to greatly increase the potential of HCFs for different applications, such as sensing, nonlinear optics, etc. In this paper, we present a combination of a standard, multimode fiber (MMF) optic coupler with a hollow core photonic bandgap fiber through arc fusion splicing and its application for the purpose of multiphoton spectroscopy. The presented splicing method is of high affordability due to the low cost of arc fusion splicers, and the measured splicing loss (SL) of the HCF-MMF splice is as low as (0.32 ± 0.1) dB, while the splice itself is durable enough to withstand a bending radius (rbend) of 1.8 cm. This resulted in a hybrid between the hollow core photonic bandgap fiber (HCPBF) and MMF coupler, delivering 20 mW of average power and 250-fs short laser pulses to the sample, which was good enough to test the proposed sensor setup in a simple, proof-of-concept multiphoton fluorescence excitation-detection experiment, allowing the successful measurement of the fluorescence emission spectrum of 10−5 M fluorescein solution. In our opinion, the presented results indicate the possibility of creating multi-purpose HCF setups, which would excel in various types of sensing applications.

ACS Style

Hanna Izabela Stawska; Maciej Andrzej Popenda; Elżbieta Bereś-Pawlik. Combining Hollow Core Photonic Crystal Fibers with Multimode, Solid Core Fiber Couplers through Arc Fusion Splicing for the Miniaturization of Nonlinear Spectroscopy Sensing Devices. Fibers 2018, 6, 77 .

AMA Style

Hanna Izabela Stawska, Maciej Andrzej Popenda, Elżbieta Bereś-Pawlik. Combining Hollow Core Photonic Crystal Fibers with Multimode, Solid Core Fiber Couplers through Arc Fusion Splicing for the Miniaturization of Nonlinear Spectroscopy Sensing Devices. Fibers. 2018; 6 (4):77.

Chicago/Turabian Style

Hanna Izabela Stawska; Maciej Andrzej Popenda; Elżbieta Bereś-Pawlik. 2018. "Combining Hollow Core Photonic Crystal Fibers with Multimode, Solid Core Fiber Couplers through Arc Fusion Splicing for the Miniaturization of Nonlinear Spectroscopy Sensing Devices." Fibers 6, no. 4: 77.

Journal article
Published: 10 August 2018 in Polymers
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In this paper, we present numerical studies of several different structures of anti-resonant, hollow core optical fibers. The cladding of these fibers is based on the Kagomé lattice concept, with some of the core-surrounding lattice cells removed. This modification, by creating additional, glass-free regions around the core, results in a significant improvement of some important optical fiber parameters, such as confinement loss (CL), bending loss (BL), and dispersion parameter (D). According to the conducted simulations (with fused silica glass being the structure’s material), CL were reduced from ~0.36 dB/m to ~0.16 dB/m (at 760 nm wavelength) in case of the structure with removed cells, and did not exceed the value of 1 dB/m across the 700–850 nm wavelength range. Additionally, proposed structure exhibits a remarkably low value of D—from 1.5 to 2.5 ps/(nm × km) at the 700–800 nm wavelength range, while the BL were estimated to be below 0.25 dB/m for bending radius of ~1.5 cm. CL and D were simulated, additionally, for structures made of acrylic glass polymethylmethacrylate, (PMMA), with similarly good results—DPMMA ∊ [2, 4] ps/(nm × km) and CLPMMA ≈ 0.13 dB/m (down from 0.41 dB/m), for the same spectral regions (700–800 nm bandwidth for D, and 760 nm wavelength for CL).

ACS Style

Hanna Izabela Stawska; Maciej Andrzej Popenda; Elżbieta Bereś-Pawlik. Anti-Resonant Hollow Core Fibers with Modified Shape of the Core for the Better Optical Performance in the Visible Spectral Region—A Numerical Study. Polymers 2018, 10, 899 .

AMA Style

Hanna Izabela Stawska, Maciej Andrzej Popenda, Elżbieta Bereś-Pawlik. Anti-Resonant Hollow Core Fibers with Modified Shape of the Core for the Better Optical Performance in the Visible Spectral Region—A Numerical Study. Polymers. 2018; 10 (8):899.

Chicago/Turabian Style

Hanna Izabela Stawska; Maciej Andrzej Popenda; Elżbieta Bereś-Pawlik. 2018. "Anti-Resonant Hollow Core Fibers with Modified Shape of the Core for the Better Optical Performance in the Visible Spectral Region—A Numerical Study." Polymers 10, no. 8: 899.

Conference paper
Published: 01 July 2018 in 2018 20th International Conference on Transparent Optical Networks (ICTON)
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In this paper an ultrathin lensed fiber-optics probe for multiphoton fluorescence endoscopy is presented. The probe is made by attaching a segment of multimode (MM) fiber to the distal end of the hollow core, photonic bandgap fiber (HCPBF) and generating a curved surface at the tip of the MM fiber using a fiber arc fusion splicer the electric arc of a fusion splicer. The curved surface served as a micro fiber-optic lens and focused the exiting light beam. It simultaneously protected the HCF tip against contamination.

ACS Style

Hanna Stawska; Maciej Popenda; Lukasz Langer; Elzbieta Beres Pawlik. Application of the Hollow Core Fiber Ended with Fiber Microlens in the Multiphoton Excitation Setup. 2018 20th International Conference on Transparent Optical Networks (ICTON) 2018, 1 -4.

AMA Style

Hanna Stawska, Maciej Popenda, Lukasz Langer, Elzbieta Beres Pawlik. Application of the Hollow Core Fiber Ended with Fiber Microlens in the Multiphoton Excitation Setup. 2018 20th International Conference on Transparent Optical Networks (ICTON). 2018; ():1-4.

Chicago/Turabian Style

Hanna Stawska; Maciej Popenda; Lukasz Langer; Elzbieta Beres Pawlik. 2018. "Application of the Hollow Core Fiber Ended with Fiber Microlens in the Multiphoton Excitation Setup." 2018 20th International Conference on Transparent Optical Networks (ICTON) , no. : 1-4.

Communication
Published: 06 October 2017 in Sensors
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In this paper, an application of negative curvature hollow core fiber (NCHCF) in an all-fiber, multiphoton fluorescence sensor setup is presented. The dispersion parameter (D) of this fiber does not exceed the value of 5 ps/nm × km across the optical spectrum of (680–750) nm, making it well suited for the purpose of multiphoton excitation of biological fluorophores. Employing 1.5 m of this fiber in a simple, all-fiber sensor setup allows us to perform multiphoton experiments without any dispersion compensation methods. Multiphoton excitation of nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) with this fiber shows a 6- and 9-fold increase, respectively, in the total fluorescence signal collected when compared with the commercial solution in the form of a hollow-core photonic band gap fiber (HCPBF). To the author’s best knowledge, this is the first time an NCHCF was used in an optical-fiber sensor setup for multiphoton fluorescence experiments.

ACS Style

Maciej Andrzej Popenda; Hanna Izabela Stawska; Leszek Mateusz Mazur; Konrad Jakubowski; Alexey Kosolapov; Anton Kolyadin; Elżbieta Bereś-Pawlik. Application of Negative Curvature Hollow-Core Fiber in an Optical Fiber Sensor Setup for Multiphoton Spectroscopy. Sensors 2017, 17, 2278 .

AMA Style

Maciej Andrzej Popenda, Hanna Izabela Stawska, Leszek Mateusz Mazur, Konrad Jakubowski, Alexey Kosolapov, Anton Kolyadin, Elżbieta Bereś-Pawlik. Application of Negative Curvature Hollow-Core Fiber in an Optical Fiber Sensor Setup for Multiphoton Spectroscopy. Sensors. 2017; 17 (10):2278.

Chicago/Turabian Style

Maciej Andrzej Popenda; Hanna Izabela Stawska; Leszek Mateusz Mazur; Konrad Jakubowski; Alexey Kosolapov; Anton Kolyadin; Elżbieta Bereś-Pawlik. 2017. "Application of Negative Curvature Hollow-Core Fiber in an Optical Fiber Sensor Setup for Multiphoton Spectroscopy." Sensors 17, no. 10: 2278.

Proceedings article
Published: 10 February 2017 in Optical Fibers and Their Applications 2017
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In this paper, we present the project and usage of multiphoton fluorescence spectroscopy sensor, based on the photonic crystal fiber as an excitation pulse transmission medium and four POF fibers acting as an emission collection elements. Usage of the photonic crystal fiber as a transmission medium allowed us to transmit the 780 nm excitation pulse with total time spread as low as 65 fs, which resulted in pulse broadening from the base 127 fs to 192 fs. Pulse was focused onto the sample via the GRIN lens, which resulted in an observable fluorescence. Collection tips of the POF fibers were additionally angled to move the collection cones towards the GRIN lens focal point, which resulted in further increase of the collection efficiency. This allowed to create a sensor capable of measuring fluorescence emission of the fluorescein solution with concentration as low as 10-4 M, with very low amount of bulk optics between the sensor and the spectrometer. © (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

ACS Style

Maciej Popenda; Hanna Stawska; Elżbieta Bereś-Pawlik. Multiphoton fluorescence spectroscopy optical fiber sensor. Optical Fibers and Their Applications 2017 2017, 10325, 103250 .

AMA Style

Maciej Popenda, Hanna Stawska, Elżbieta Bereś-Pawlik. Multiphoton fluorescence spectroscopy optical fiber sensor. Optical Fibers and Their Applications 2017. 2017; 10325 ():103250.

Chicago/Turabian Style

Maciej Popenda; Hanna Stawska; Elżbieta Bereś-Pawlik. 2017. "Multiphoton fluorescence spectroscopy optical fiber sensor." Optical Fibers and Their Applications 2017 10325, no. : 103250.

Proceedings article
Published: 08 December 2016 in Laser Technology 2016: Progress and Applications of Lasers
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This paper presents investigation of normal and cancerous tissue by the means of one and two photon fluorescence spectroscopy. A comparison those methods has been conducted, allowing for eventual determination of granting the best possible diagnostic results.

ACS Style

Elżbieta Bereś-Pawlik; Hanna Stawska; Maciej Popenda; Łukasz Pajewski; Natalia Malinowska; Robert Hossa. Multiphoton, optical fiber-based fluorescence spectroscopy. Laser Technology 2016: Progress and Applications of Lasers 2016, 10159, 1015913 .

AMA Style

Elżbieta Bereś-Pawlik, Hanna Stawska, Maciej Popenda, Łukasz Pajewski, Natalia Malinowska, Robert Hossa. Multiphoton, optical fiber-based fluorescence spectroscopy. Laser Technology 2016: Progress and Applications of Lasers. 2016; 10159 ():1015913.

Chicago/Turabian Style

Elżbieta Bereś-Pawlik; Hanna Stawska; Maciej Popenda; Łukasz Pajewski; Natalia Malinowska; Robert Hossa. 2016. "Multiphoton, optical fiber-based fluorescence spectroscopy." Laser Technology 2016: Progress and Applications of Lasers 10159, no. : 1015913.

Conference paper
Published: 01 July 2015 in 2015 17th International Conference on Transparent Optical Networks (ICTON)
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In this paper we present the possibilities of cheap diagnostics based on optical fiber sensors and fluorescence lifetime measurements. Early diagnostics of pathological tissue changes, especially when it comes to lesions that are possibly cancerous is still undiscovered for commercial use. Methods used nowadays, which are focused on scanning large areas of the human body (MRI, CT) are sensitive, yet they cannot determine whether the tumor is benign or malignant. Optical methods based on fluorescence are seeing more and more use, and eventually they may become a standard when it comes to fast and non-invasive medical diagnostics. We present a fluorescence lifetime measurements of cancerous and healthy human tissue performed with the use of a very simple optical fiber sensor. Results obtained on a standard fluorescent dyes (fluorescein in NaOH solution) show, that this setup was capable of measuring decay times of the nanosecond region, which is enough for most of the endogenous fluorophores of human body. Results obtained for human tissue show a difference between fluorescence lifetimes of healthy and cancerous human tissue. This a preliminary experiment, just to determine both spatial and time resolution of our setup, our primary goal is to perform such an examination during standard surgical procedure.

ACS Style

M. Popenda; L. Pajewski; Z. Grzebieniak; E. Beres-Pawlik; Popenda M.. Fluorescence lifetime measurements with all-fiber optical setup for non-invasive in-vivo diagnostics. 2015 17th International Conference on Transparent Optical Networks (ICTON) 2015, 1 -4.

AMA Style

M. Popenda, L. Pajewski, Z. Grzebieniak, E. Beres-Pawlik, Popenda M.. Fluorescence lifetime measurements with all-fiber optical setup for non-invasive in-vivo diagnostics. 2015 17th International Conference on Transparent Optical Networks (ICTON). 2015; ():1-4.

Chicago/Turabian Style

M. Popenda; L. Pajewski; Z. Grzebieniak; E. Beres-Pawlik; Popenda M.. 2015. "Fluorescence lifetime measurements with all-fiber optical setup for non-invasive in-vivo diagnostics." 2015 17th International Conference on Transparent Optical Networks (ICTON) , no. : 1-4.

Journal article
Published: 30 June 2014 in Photonics Letters of Poland
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ACS Style

Elzbieta Maria Beres-Pawlik; Hanna Stawska; Mariusz Sliwa; Wojciech Sokol; Zbigniew Kulas; Lukasz Klonowski; Maciej Popenda; Marcin Kochanowicz; Jacek Zmojda; Dominik Dorosz. Fiber fluorescent spectroscopy. Photonics Letters of Poland 2014, 6, 1 .

AMA Style

Elzbieta Maria Beres-Pawlik, Hanna Stawska, Mariusz Sliwa, Wojciech Sokol, Zbigniew Kulas, Lukasz Klonowski, Maciej Popenda, Marcin Kochanowicz, Jacek Zmojda, Dominik Dorosz. Fiber fluorescent spectroscopy. Photonics Letters of Poland. 2014; 6 (2):1.

Chicago/Turabian Style

Elzbieta Maria Beres-Pawlik; Hanna Stawska; Mariusz Sliwa; Wojciech Sokol; Zbigniew Kulas; Lukasz Klonowski; Maciej Popenda; Marcin Kochanowicz; Jacek Zmojda; Dominik Dorosz. 2014. "Fiber fluorescent spectroscopy." Photonics Letters of Poland 6, no. 2: 1.