Article
Materials Science, Multidisciplinary
Ziyi Ge, Baoxing Xiong, Dahong Mo, Xiaopu Chen, Xiang Zhang, Xiao Yuan
Summary: This study investigates the effect of crystallization heat treatment on the growth and distribution of NaF nano-crystals in PTR glass. The results show that the growth of NaF nano-crystals is highly dependent on temperature, and higher temperature and longer time result in increased absorption and scattering losses. However, the crystallized PTR glass exhibits favorable absorption and scattering loss characteristics in the near-infrared band.
Article
Materials Science, Ceramics
Khaldoon Nasser, Sergei Ivanov, Rufina Kharisova, Alexander Ignatiev, Nikolay Nikonorov
Summary: In holographic applications, traditional photo-thermo-refractive (PTR) glass has limitations due to light scattering on large NaF nanocrystals. To overcome this issue, a novel PTR glass was developed by replacing bromine with chlorine, enabling higher silver concentration and successful recording of volume Bragg gratings.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Valdemar Stankevic, Jonas Karosas, Gediminas Raciukaitis, Paulius Gecys
Summary: In this study, elongated Type I modifications in fused silica were achieved through deep focusing radiation of a femtosecond laser, resulting in axial lengths greater than 50 μm. The transition from Type II modification to Type I modification was observed as focusing depth increased. By overlapping modifications in the radial and axial directions, a 1D phase grating in the depth range of 2-5 mm was created, enabling efficient beam splitting.
Article
Optics
Yitao Wang, Matthieu Lancry, Maxime Cavillon, Bertrand Poumellec
Summary: This paper investigates the lifetime prediction of nanogratings written in silica glass using an infrared femtosecond laser. The accelerated aging experiments and monitoring of characteristic birefringence show that these nanostructures can survive for a considerable amount of time at high temperatures, with an estimated lifespan of over 10 years after a special treatment.
Article
Optics
Qiang Bian, Alexander Podhrazsky, Constantin Bauer, Andrea Stadler, Fabian Buchfellner, Rolf Kuttler, Martin Jakobi, Wolfram Volk, Alexander W. Koch, Johannes Roths
Summary: In this study, optical fiber with both temperature and strain sensors were embedded into an aluminum cast structure during the casting process. The temperature and strain were decoupled, and the obtained values showed good performance of the metal-embedded optical fiber sensors.
Article
Optics
J. L. Cruz, Y. O. Barmenkov, A. Diez, M. Andres
Summary: This work reports the accurate measurement of the absolute modal effective refraction index and group index of single-mode optical fibers using Bragg gratings, achieving results close to the values of pristine fibers. The technique is useful for testing different types of fibers and has the potential for various applications after careful calibration.
Article
Materials Science, Multidisciplinary
Khaldoon Nasser, Vladimir Aseev, Sergey Ivanov, Alexander Ignatiev, Nikolay Nikonorov
Summary: This study investigates the optical, spectral-luminescent, and holographic properties of chlorine-containing photo-thermo-refractive (PTR) glass doped with neodymium ions. The research demonstrates the potential of using this material in applications of photonics integration and monolithic optical devices.
Article
Materials Science, Multidisciplinary
Ziyi Ge, Baoxing Xiong, Xiang Zhang, Xiao Yuan
Summary: This paper studies the effect of photo-thermo-induced nucleation on the crystallization kinetics of PTR glass and analyzes the properties of the induced nucleation process. The results show that photo-thermo-induced nucleation can significantly change the crystallization ability of PTR glass and affect the size, morphology, and volume fraction of precipitated crystals.
Article
Optics
Shaghayegh Yaraghi, Nafiseh Mohammadian, Oussama Mhibik, Kai-Han Chang, Thomas Seder, Leonid Glebov, Ivan Divliansky
Summary: Traditional head-up displays (HUDs) suffer from limited exit pupil and lack of compactness due to bulky optics. Holographic HUDs, on the other hand, provide a high-quality image with a wide field of view (FOV) and the ability to correct vision and adjust focus. However, the limited bandwidth of a spatial light modulator (SLM) imposes a trade-off between FOV and eye-box size. Combining a holographic system with an image-replicating element eliminates this trade-off.
Article
Engineering, Electrical & Electronic
Nazila Safari Yazd, Karima Chah, Christophe Caucheteur, Patrice Megret
Summary: Thermal regeneration of tilted Bragg gratings using UV lasers and different annealing profiles results in efficient regeneration in the temperature range of 850-900 degrees Celsius. The regenerated gratings show a sensitivity to the surrounding refractive index comparable to non-regenerated gratings.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Karima Chah, Ivan Chapalo, Ying-Gang Nan, Damien Kinet, Patrice Megret, Christophe Caucheteur
Summary: In this study, highly reflective fiber Bragg gratings were fabricated in perfluorinated polymer optical fibers using 800 nm femtosecond pulses and line-by-line inscription method. It was demonstrated that grating inscription could be achieved without damage with energy below 27 nJ, and the reflectivity of the grating continued to increase over several hours. The temperature-dependent behavior of the grating reflectivity and Bragg wavelength, as well as the sensitivity to humidity and axial strain, were also investigated.
Article
Optics
A. Halstuch, A. A. Ishaaya
Summary: Chirped fiber Bragg gratings (CFBGs) and arrays of fiber Bragg gratings (FBGs) were fabricated using femtosecond pulses and a single uniform phase-mask (PM). The fabricated gratings demonstrated tunability in wavelength and achieved non-overlapping inscription on fresh fiber sections. The resulting gratings exhibited spectral shifts and good performance, as measured through transmission and reflection spectra.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Materials Science, Ceramics
Khaldoon Nasser, Vladimir Aseev, Alexander Ignatiev, Nikolay Nikonorov
Summary: A new chloride photo-thermo-refractive glass doped with ytterbium ions has been developed, showing good spectroscopic and luminescent properties for laser and gain applications. The study analyzed the dependence of optical and spectral-luminescent characteristics on ytterbium concentration and determined the optimum concentration of ytterbium ions in the glass. Results also included important spectroscopic parameters obtained through measurements and theoretical approaches.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Zhiyu Zhu, Dongbing He, Lili Hu
Summary: In this study, photo-thermo-refractive (PTR) glass was used to simulate the recording processes of volume-holographic devices and investigate the effect of photothermal-induced processes on crystallization kinetics. The results showed that the formation of Ag nanoparticles surrounded by AgBr (AgF) microcrystals inhibits the crystallization kinetics of NaF microcrystals in PTR glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Engineering, Multidisciplinary
Damian Harasim
Summary: This paper presents a method to improve the reliability of liquid solution refractive index measurement using tilted fiber Bragg gratings (TFBGs), by employing a specialized setup of cascaded TFBGs to enhance the stability of cladding resonances under various light polarizations. Experimental results demonstrate the effectiveness of this approach.
Article
Thermodynamics
Francesco Mazza, Leonardo Castellanos, Dmitrii Kliukin, Alexis Bohlin
Summary: A technique for simultaneous detection of resonant and non-resonant CARS signals has been developed, providing in-situ referencing of impulsive excitation efficiency in flames. This technique offers improved accuracy in temperature measurements by utilizing the essential reference provided by non-resonant signals.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Optics
Gennady M. Mikheev, Vladimir Y. Kogai, Konstantin G. Mikheev, Tatyana N. Mogileva, Aleksandr S. Saushin, Yuri P. Svirko
Summary: The transverse polarization-sensitive photoresponse of CuSe/Se nanocomposite film on a transparent substrate is affected by the direction of irradiation, and the characteristics of the photoresponse can be controlled by changing the polarization of the excitation laser beam.
Article
Chemistry, Multidisciplinary
Alesia Paddubskaya, Konstantin Batrakov, Arkadiy Khrushchinsky, Semen Kuten, Artyom Plyushch, Andrey Stepanov, Gennady Remnev, Valery Shvetsov, Marian Baah, Yuri Svirko, Polina Kuzhir
Summary: The study found that graphene sheets remain intact after irradiation with an intense 290 keV ion beam, but the THz absorption ability of the graphene/PMMA multilayer may decrease due to heating damage of the topmost PMMA slabs produced by carbon ions; Protons do not have this negative effect due to their much longer mean free pass in PMMA; It is concluded that the particles' flux at the geostationary orbit is significantly lower than that used in the experiments, indicating that it cannot cause tangible damage to the graphene/PMMA based THz absorber.
Article
Spectroscopy
Dmitrii Kliukin, Francesco Mazza, Leonardo Castellanos, Alexis Bohlin
Summary: Cascaded coherent anti-Stokes Raman scattering (CARS) signals can be efficiently generated when propagating collinearly with the pump/Stokes and probe beams. Although this effect may complicate the analysis of CARS spectrum used for diagnostics in the gas phase, polarization control can be employed to suppress the cascaded CARS signals, and the ratio of CARS and cascaded CARS signals is independent of the probe pulse energy, making it a promising approach for wide-range absolute concentration measurements in gas-phase media.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Physics, Applied
Gennady M. Mikheev, Arseniy E. Fateev, Vladimir Ya. Kogai, Tatyana N. Mogileva, Viatcheslav V. Vanyukov, Yuri P. Svirko
Summary: This study demonstrates the dependence of relaxation time of photogenerated carriers on their spin in a thin CuSe/Se semiconductor nanocomposite film under irradiation of circularly and linearly polarized femtosecond laser beams. The duration and polarity of the photovoltage pulses change based on the polarization state of the excitation beam. The helicity-sensitive temporal profile of the photoresponse is attributed to the interference of photocurrents generated by surface photogalvanic effects in the subsurface layer of the film.
APPLIED PHYSICS LETTERS
(2021)
Article
Thermodynamics
Francesco Mazza, Nathan Griffioen, Leonardo Castellanos, Dmitrii Kliukin, Alexis Bohlin
Summary: This study presents the application of ultrabroadband two-beam femtosecond/picosecond coherent Raman spectroscopy on the ro-vibrational spectra of CO2 and O-2 for thermometry and concentration measurements. The experimental system utilizes fs-laser-induced filamentation to generate a compressed supercontinuum, enabling the excitation of all rovibrational Raman transitions. The study also develops time-domain models to simulate the ro-vibrational spectra and successfully measures CO2 and O-2 in the flame products.
COMBUSTION AND FLAME
(2022)
Article
Nanoscience & Nanotechnology
Lena Golubewa, Tatsiana Kulahava, Igor Timoshchenko, Mikhail Shuba, Yuri Svirko, Polina Kuzhir
Summary: Short SWCNTs can enter cells via endocytosis without autophagy; their driven effects initiate rapid cellular responses in the initial stage and later form micron-sized structures; the delayed effects of SWCNTs include suppression of cell proliferative activity, which recovers in subsequent passages.
Article
Chemistry, Physical
V. V. Vanyukov, M. Shuba, A. G. Nasibulin, Y. P. Svirko, P. P. Kuzhir, G. M. Mikheev
Summary: The nonlinear absorption and refraction of free-standing films made of single-walled carbon nanotubes (SWNTs) have been studied experimentally and theoretically, analyzing the effects of laser pulse duration and dynamic Burstein-Moss shift on saturation intensity. Experimental results showed high absorption modulation depth and red-shifted saturation intensity minimum due to dynamic Burstein-Moss shift. Measurements also revealed negative nonlinear refractive index at specific wavelengths.
Article
Nanoscience & Nanotechnology
Lena Golubewa, Tatsiana Kulahava, Aliona Klimovich, Danielis Rutkauskas, Ieva Matulaitiene, Renata Karpicz, Nikita Belko, Dmitri Mogilevtsev, Alena Kavalenka, Marina Fetisova, Petri Karvinen, Yuri Svirko, Polina Kuzhir
Summary: In this study, it is demonstrated that green fluorescence graphene quantum dots can detect the presence of hypochlorous acid and selectively detect reactive chlorine species produced by neutrophils. Changes in the fluorescence of GQDs under different conditions make them a promising sensing agent for biomedical applications.
Article
Nanoscience & Nanotechnology
Marian Baah, Afifa Rahman, Sarah Sibilia, Gianmarco Trezza, Luigi Ferrigno, Laura Micheli, Antonio Maffucci, Ekaterina Soboleva, Yuri Svirko, Polina Kuzhir
Summary: This paper proposes an original approach for real-time detection of industrial organic pollutants in water based on the time evolution monitoring of the electrical impedance of low-cost graphitic nanomembranes. The approach utilizes the high sensitivity of 2D graphene-related materials to adsorbents. The study examines the sensitivity of nanomembranes based on pyrolyzed photoresist, pyrolytic carbon (PyC), and multilayer graphene films, and demonstrates the correlation between the sensitivity of electric impedance to adsorbents and the structure of the nanomembranes. The results reveal that amorphous PyC, being the most homogeneous and adhesive to the SiO2 substrate, shows the most promising integration capability into industrial pollutants sensors.
Article
Chemistry, Physical
Subhajit Bej, Toni Saastamoinen, Yuri P. Svirko, Jari Turunen
Summary: Nanocomposites with tailored optical properties have diverse applications, and traditional effective medium methods have limitations, while grating theory and Fourier Eigenmode Method offer viable alternatives for modeling optical properties. This technique allows for the calculation of nanocomposite characteristics regardless of morphology and volume fill fraction restrictions, demonstrating its versatility in various types of nanocomposites.
Article
Chemistry, Multidisciplinary
Alesia Paddubskaya, Nadzeya Valynets, Sergey Maksimenko, Mukesh Kumar, Marian Baah, Markku Pekkarinen, Yuri Svirko, Gintaras Valusis, Polina Kuzhir
Summary: The proposed technique utilizes a 3D printed array of polymer hemispheres covered with a thin conductive layer to fabricate terahertz metasurfaces, which can effectively suppress THz reflectivity. The addition of graphene enhances the structure and broadens the frequency range of suppression. Scaling up the technique allows for customized electromagnetic responses of metasurfaces for various THz photonics components.
Article
Nanoscience & Nanotechnology
Yaraslau Padrez, Lena Golubewa, Anastasiya Bahdanava, Marija Jankunec, Ieva Matulaitiene, Dmitry Semenov, Renata Karpicz, Tatsiana Kulahava, Yuri Svirko, Polina Kuzhir
Summary: A systematic spectroscopic characterization of highly homogeneous water suspensions of 'buckydiamonds' revealed four types of specific structures on the ND surface that demonstrate excitation-wavelength-dependent photoluminescence (PL). The PL properties of NDs suspensions show concentration-dependent behavior, indicating a tendency for NDs to agglomerate. The pH sensitivity of the 'buckydiamonds' was explored, and it was found that they can serve as all-optical sensors for tiny pH variations in a wide range of pH values.
Article
Physics, Applied
A. Ospanova, M. Cojocari, P. Lamberti, A. Plyushch, L. Matekovits, Yu. Svirko, P. Kuzhir, A. Basharin
Summary: According to the Babinet principle, the diffraction pattern from an opaque body is identical to that from a hole of the same shape and size. We propose a Babinet principle-based metamaterial made of two complementary metal/hole checkerboards, which demonstrates absolute transparency in a broad frequency range. The proven concept of simple, reproducible, and scalable design of the Babinet metamaterial paves the way for the fabrication of broadband transparent devices at any frequency, including THz and optical ranges.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Timofei Eremin, Valentina Eremina, Yuri Svirko, Petr Obraztsov
Summary: Covalent functionalization of single-walled carbon nanotubes (SWCNTs) can greatly enhance their photoluminescent (PL) brightness, making them suitable for infrared light emitters.
