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Photonics
Special Issues
Optical Spectroscopy and Applications
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Optical Spectroscopy and Applications

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 6458

Special Issue Editor

Dr. Kirill Laptinskiy

E-Mail Website
Guest Editor
Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University, Moscow, Russia
Interests: optical spectroscopy; fluorescence; Raman spectroscopy; FTIR-spectroscopy; machine learning; artificial neural networks; nanoparticles

Special Issue Information

Dear Colleagues,

The active development of science and technology makes it possible to solve ever more complex problems. Originating in 1802 with the discovery of Fraunhofer lines, today optical spectroscopy is experiencing a real burgeoning. The creation and modification of research methods using optical spectroscopy finds a wide variety of applications—from solving scientific problems in the study of various interactions, to nondestructive evaluation, art/biological/medical diagnosis, and security.

This Special Issue focuses on the latest research and developments related to the broad category of optical spectroscopy (Raman, UV/Vis, fluorescence, FTIR, etc.) and applications. We would like to showcase recent advances in spectroscopy, obtained with new optical design, advanced spectroscopy principles, and improved or modified measurement techniques; and successful applications in various fields. This Special Issue welcomes high-quality original research or review articles reporting on the latest discoveries in optical spectroscopy and its applications, especially those that highlight the potential of use of optical spectroscopy in a variety of topics, including but not limited to the following:

  • Nonlinear and coherent optics;
  • Optical spectroscopy of advanced materials;
  • Nanophotonics and probe microscopy;
  • Fundamentals and theory of optical spectroscopy;
  • Novel techniques, analytics, and applications.

Best regards,

Dr. Kirill Laptinskiy
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (5 papers)

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Research

14 pages, 3638 KiB  
Article
The Influence of Concentrations of Sensitizers and Activators on Luminescence Kinetics Parameters of Up-Conversion Nanocomplexes NaYF4:Yb3+/Tm3+
by Sergey Burikov, Ekaterina Filippova, Vera Proydakova, Sergey Kuznetsov, Valery Voronov, Natalia Tabachkova and Tatiana Dolenko
Photonics 2024, 11(3), 228; https://doi.org/10.3390/photonics11030228 - 29 Feb 2024
Viewed by 782
Abstract
For colloids of NaYF4:Yb3+/Tm3+ nanoparticles in DMSO, by the method of time-resolved luminescence spectroscopy with nanosecond pulsed excitation at a wavelength of 975 nm, the photophysical processes that determine the course of kinetic curves have been revealed. It [...] Read more.
For colloids of NaYF4:Yb3+/Tm3+ nanoparticles in DMSO, by the method of time-resolved luminescence spectroscopy with nanosecond pulsed excitation at a wavelength of 975 nm, the photophysical processes that determine the course of kinetic curves have been revealed. It has been found that the luminescence rise time decreases with an increase in the concentration of activators and sensitizers due to the increase in the efficiency of energy transfer from sensitizers to activators. The cross-relaxation of the excited states of activators provides a decrease in the luminescence decay time with an increase in the concentration of activators and a constant concentration of the sensitizer. There is no correlation between the time of luminescence decay with the change in the concentration of sensitizers and the constant concentration of activators due to the competition of the processes of energy back transfer from activators to sensitizers and the “feeding” of activators by excitations coming from remote sensitizer ions. Full article
(This article belongs to the Special Issue Optical Spectroscopy and Applications)
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17 pages, 3573 KiB  
Article
Optical Filter Design for Daylight Outdoor Electroluminescence Imaging of PV Modules
by Mahmoud Dhimish and Andy M. Tyrrell
Photonics 2024, 11(1), 63; https://doi.org/10.3390/photonics11010063 - 7 Jan 2024
Viewed by 1232
Abstract
This paper presents an advanced outdoor electroluminescence (EL) imaging system for inspecting solar photovoltaic (PV) modules under varying daylight conditions. EL imaging, known for its effectiveness in non-destructively detecting PV module defects, is enhanced through specialized optical filters. These filters, including a bandpass [...] Read more.
This paper presents an advanced outdoor electroluminescence (EL) imaging system for inspecting solar photovoltaic (PV) modules under varying daylight conditions. EL imaging, known for its effectiveness in non-destructively detecting PV module defects, is enhanced through specialized optical filters. These filters, including a bandpass filter targeting EL emissions and a neutral density filter to reduce background light, significantly improve the system’s signal-to-noise ratio (SNR). The experimental results demonstrate the system’s enhanced performance, with superior clarity and detail in EL emissions, enabling precise defect localization and characterization at the cellular level. Notably, the system achieves an SNR improvement, with values consistently above two, outperforming previous systems and confirming its suitability for efficient solar PV maintenance and diagnostics. This research offers a flexible approach to optimizing EL imaging quality across various solar irradiance levels and angles, essential for improved PV module performance and reliability. The system effectively handles different PV module configurations, orientations, and types, including monofacial and bifacial arrays. It showcases robust imaging capabilities under high solar irradiance and different sun illumination levels, maintaining high-quality imaging due to its optimized filter design. Additionally, the system’s adaptability in detecting EL emissions from series-connected PV modules is highlighted, demonstrating its comprehensive evaluation capabilities for PV array performance. Full article
(This article belongs to the Special Issue Optical Spectroscopy and Applications)
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0 pages, 2305 KiB  
Article
Non-Invasive Hemoglobin Assessment with NIR Imaging of Blood Vessels in Transmittance Geometry: Monte Carlo and Experimental Evaluation
by Ilia Bardadin, Vladimir Petrov, Georgy Denisenko, Artashes Armaganov, Anna Rubekina, Daria Kopytina, Vladimir Panov, Petr Shatalov, Victoria Khoronenko, Petr Shegai, Andrey Kaprin, Andrey Shkoda and Boris Yakimov
Photonics 2024, 11(1), 49; https://doi.org/10.3390/photonics11010049 - 3 Jan 2024
Cited by 1 | Viewed by 1348
Abstract
Non-invasive methods for determining blood hemoglobin (Hb) concentration are urgently needed to avoid the painful and time-consuming process of invasive venous blood sampling. Many such methods rely on assessing the average attenuation of light over a tissue area where hemoglobin is the dominant [...] Read more.
Non-invasive methods for determining blood hemoglobin (Hb) concentration are urgently needed to avoid the painful and time-consuming process of invasive venous blood sampling. Many such methods rely on assessing the average attenuation of light over a tissue area where hemoglobin is the dominant chromophore, without separating those areas corresponding to vessels and bloodless tissue. In this study, we investigate whether it is possible to determine hemoglobin levels in the blood by assessing the changes in light intensity when passing through large vessels in comparison to adjacent tissues, using this as a Hb level predictor. Using Monte Carlo light transport modeling, we evaluate the accuracy of determining hemoglobin levels via light intensity contrast and vessel widths estimated in the transmittance illumination geometry and estimate the influence of physiologically significant parameters such as vessel depth, dermis vascularization, and melanin content in the epidermis on the blood Hb prediction error. The results show that physiological variations in tissue parameters limit the mean absolute error of this method to ~15 g/L for blood Hb levels varying in the 60–160 g/L range, which finding is also supported by experimental data obtained for volunteers with different total blood Hb levels that have been determined invasively. We believe the application of new approaches to the non-invasive assessment of Hb levels will lead to the creation of reliable and accurate devices that are applicable in point-of-care and clinical practice. Full article
(This article belongs to the Special Issue Optical Spectroscopy and Applications)
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11 pages, 2597 KiB  
Article
Multiwavelength Fluorescence and Diffuse Reflectance Spectroscopy for an In Situ Analysis of Kidney Stones
by Polina S. Tseregorodtseva, Gleb S. Budylin, Nadezhda V. Zlobina, Zare A. Gevorkyan, Daria A. Filatova, Daria A. Tsigura, Artashes G. Armaganov, Andrey A. Strigunov, Olga Y. Nesterova, David M. Kamalov, Elizaveta V. Afanasyevskaya, Elena A. Mershina, Nikolay I. Sorokin, Valentin E. Sinitsyn, Armais A. Kamalov and Evgeny A. Shirshin
Photonics 2023, 10(12), 1353; https://doi.org/10.3390/photonics10121353 - 8 Dec 2023
Viewed by 1298
Abstract
This study explores the use of diffuse reflectance spectroscopy (DRS) and multiwavelength fluorescence spectroscopy for real-time kidney stone identification during laser lithotripsy. Traditional methods are not suitable for in situ analysis, so the research focuses on optical techniques that can be integrated with [...] Read more.
This study explores the use of diffuse reflectance spectroscopy (DRS) and multiwavelength fluorescence spectroscopy for real-time kidney stone identification during laser lithotripsy. Traditional methods are not suitable for in situ analysis, so the research focuses on optical techniques that can be integrated with lithotripsy fibers. Experiments were conducted ex vivo, using DRS and multiwavelength fluorescence spectroscopy (emission–excitation matrix (EEM)) to distinguish between 48 urinary stones of three types: urate, oxalate and hydroxyapatite, with infrared spectroscopy as a reference. A classification model was developed based on EEM and DRS data. Initial classification relying solely on EEM data achieved an f1-score of 87%, which increased to 92% when DRS data were included. The findings suggest that optical spectroscopy can effectively determine stone composition during laser lithotripsy, potentially enhancing surgical outcomes via the real-time automatic optimization of laser radiation parameters. Full article
(This article belongs to the Special Issue Optical Spectroscopy and Applications)
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18 pages, 3816 KiB  
Article
Density Functional Study of Structural and Vibrational Properties of α-Moganite
by Dmitrii Pankin, Mikhail Smirnov, Evgenii Roginskii, Aleksandr Savin, Ilya Kolesnikov and Anastasia Povolotckaia
Photonics 2023, 10(12), 1346; https://doi.org/10.3390/photonics10121346 - 6 Dec 2023
Cited by 1 | Viewed by 1328
Abstract
α-moganite is a recently discovered polymorph of silica, commonly intergrown with quartz in natural microcrystalline silica samples. An important challenge is finding an effective method for estimating its amount in a sample under study, which is important for its applications, related to the [...] Read more.
α-moganite is a recently discovered polymorph of silica, commonly intergrown with quartz in natural microcrystalline silica samples. An important challenge is finding an effective method for estimating its amount in a sample under study, which is important for its applications, related to the technology of growth of dielectric layers, as well as for fundamental problems, related to the formation of both terrestrial and lunar mineral deposits and biogenic formation. One of these methods is vibrational spectroscopy, with the help of which the presence of a particular compound is determined by the presence of characteristic spectral lines. In this work, the search for such lines is carried out using density functional theory calculations and comparisons of the IR and Raman spectra of α-quartz and α-moganite. With the help of such calculations, the stability of the moganite structure has been proven for the first time, and its spectral characteristics have been determined over the entire range of vibrational frequencies. Several new spectral lines characteristic of α-moganite were discovered in the 65–85 cm−1 region. Moreover, the evolution of spectral peculiarities under hydrostatic pressure was studied. Full article
(This article belongs to the Special Issue Optical Spectroscopy and Applications)
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