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Photonics
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Photonics: Theory, Technologies and Applications
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Photonics: Theory, Technologies and Applications

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

Deadline for manuscript submissions: closed (25 July 2023) | Viewed by 8688

Special Issue Editors

Dr. Sergey Y. Yurish

E-Mail Website
Guest Editor
International Frequency Sensor Association (IFSA), 08860 Castelldefels, Spain
Interests: smart sensors; optical sensors; frequency measurements
Special Issues, Collections and Topics in MDPI journals
Dr. Aleksej Rodin

E-Mail Website
Guest Editor
Solid State Laser Laboratory, Department of Laser Technologies, Center for Physical Sciences and Technology, Savanoriu Ave. 231, 02300 Vilnius, Lithuania
Interests: pulse amplifiers; optical parametric amplifiers; laser
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will host a collection of extended papers published following the 6th International Conference on Optics, Photonics and Lasers (OPAL’ 2023), Funchal (Madeira Island), Portugal, 24–26 May 2023.

The event incorporates three symposiums covering a broad range in optics, photonics and lasers and provide an excellent opportunity to exchange ideas and present the latest advancements in these areas. The OPAL’ 2023 is organized by the IFSA—a professional, non-profit association that has served academia and the industry for more than 20 years.

The purpose of OPAL’ 2023 is bring together leading international researchers, engineers and practitioners interested in any aspect of optical-related technologies.

The Special Issue will include the following topics:

  • Photonic Sensors
  • Photodetectors
  • Photonic Integrated Circuit (PIC)
  • Photonic Integration and Packaging
  • Photonic Crystals
  • Silicon Photonics
  • Biophotonics
  • Microwave Photonics
  • Nanophotonics
  • Photonic Materials and Metamaterials
  • Quantum Photonics
  • Terahertz Photonics
  • Photonic Computing
  • Organic Photonic Materials and Devices
  • 2D Photonic Materials and Devices
  • Photonic Instrumentation Engineering
  • Applications of Photonic Technologies

Dr. Sergey Y. Yurish
Dr. Aleksej Rodin
Guest Editors

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.

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (5 papers)

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Research

12 pages, 7958 KiB  
Article
Dissimilar Laser Beam Welding of Titanium to Stainless Steel Using Pure Niobium as Filler Material in Lap Joint Configuration
by Michael Wiegand, Alexander Kimm, Niklas Sommer, Linda Marks, Martin Kahlmeyer and Stefan Böhm
Photonics 2023, 10(9), 1063; https://doi.org/10.3390/photonics10091063 - 20 Sep 2023
Cited by 2 | Viewed by 1506
Abstract
In the present investigation, commercially pure titanium is welded to AISI 316L stainless steel by intermixing niobium as filler material in a lap joint configuration. For this purpose, a pulsed Nd:YAG laser with various pulse durations and pulse peak powers is employed to [...] Read more.
In the present investigation, commercially pure titanium is welded to AISI 316L stainless steel by intermixing niobium as filler material in a lap joint configuration. For this purpose, a pulsed Nd:YAG laser with various pulse durations and pulse peak powers is employed to obtain different mixing conditions for the materials. It will be demonstrated that, despite the implementation of the filler material, the weld seams are characterized by a high affinity for cracking, which in turn can be attributed to the formation of hard intermetallic compounds. Nevertheless, utilization of optimized process parameters can yield crack-free specimens in a reproducible manner through equable intermixing of otherwise critical alloy elements. Lap-shear forces of up to 140 N can be achieved with a single weld seam measuring 2.5 mm in length. By increasing the joint area with four adjacent weld seams, maximum loads up to 320 N are attained, thus exceeding the yield strength of the applied stainless steel. Considering the biocompatibility of the niobium filler material used, this work provides the foundation for this dissimilar material combination to be implemented in future medical technology applications. Full article
(This article belongs to the Special Issue Photonics: Theory, Technologies and Applications)
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11 pages, 9874 KiB  
Article
Optimizing Self-Seeded Perfluorooctane SBS Compressor Configurations to Achieve ~90 ps High-Energy Pulses
by Aleksej M. Rodin, Augustė Černeckytė, Paulius Mackonis and Augustinas Petrulėnas
Photonics 2023, 10(9), 1060; https://doi.org/10.3390/photonics10091060 - 20 Sep 2023
Cited by 2 | Viewed by 1451
Abstract
Three different stimulated Brillouin scattering (SBS) configurations in perfluorooctane were experimentally compared to achieve the ultimate compression of ~1.1 ns pulses from a commercially available Nd:YAG mini-laser. These schemes contained either a focusing lens and a plane feedback mirror, a spherical mirror, or [...] Read more.
Three different stimulated Brillouin scattering (SBS) configurations in perfluorooctane were experimentally compared to achieve the ultimate compression of ~1.1 ns pulses from a commercially available Nd:YAG mini-laser. These schemes contained either a focusing lens and a plane feedback mirror, a spherical mirror, or variable pulse splitting to provide self-seeding of the SBS. In the optimal configuration with a focusing lens and return mirror, 93 ps pulses with an energy of 9.5 mJ were achieved at the output of the double-pass phase-conjugated Nd:YAG amplifier. The resulting diffraction-free, high-quality beams with M2~1.2 and excellent pointing stability are of practical interest for scientific, medical, and industrial applications. Full article
(This article belongs to the Special Issue Photonics: Theory, Technologies and Applications)
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12 pages, 2569 KiB  
Article
UV Resistance of Super-Hydrophobic Stainless Steel Surfaces Textured by Femtosecond Laser Pulses
by Oleksiy Myronyuk, Denys Baklan and Aleksej M. Rodin
Photonics 2023, 10(9), 1005; https://doi.org/10.3390/photonics10091005 - 3 Sep 2023
Cited by 4 | Viewed by 1244
Abstract
The loss of spontaneous liquid repellency on the surface of AISI 304 stainless steel under UV irradiation has been investigated depending on the textures formed by femtosecond laser pulses using Owens–Wendt plot analysis. Laser-induced periodic surface structures (LIPSS) have shown less liquid repellency [...] Read more.
The loss of spontaneous liquid repellency on the surface of AISI 304 stainless steel under UV irradiation has been investigated depending on the textures formed by femtosecond laser pulses using Owens–Wendt plot analysis. Laser-induced periodic surface structures (LIPSS) have shown less liquid repellency compared to microgrooves. The polarity of the super-hydrophobic non-polar layer increased under UV irradiation to a super-hydrophilic state. The rate of this transition is determined by the surface topography and was faster for LIPSS compared to the bihierarchical textures formed by LIPSS in combination with microgrooves. The applicability of the Owens–Wendt approach for the numerical comparison of the achievable liquid repellency of textured surfaces in the Cassie state and the degree of polarity reversal of the hydrophobic layer was shown. Full article
(This article belongs to the Special Issue Photonics: Theory, Technologies and Applications)
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18 pages, 25209 KiB  
Article
Robust Topological Edge States in C6 Photonic Crystals
by Daniel Borges-Silva, Carlos Humberto Oliveira Costa and Claudionor Gomes Bezerra
Photonics 2023, 10(9), 961; https://doi.org/10.3390/photonics10090961 - 22 Aug 2023
Cited by 3 | Viewed by 1833
Abstract
The study of photonic crystals has emerged as an attractive area of research in nanoscience in the last years. In this work, we study the properties of a two-dimensional photonic crystal composed of dielectric rods. The unit cell of the system is composed [...] Read more.
The study of photonic crystals has emerged as an attractive area of research in nanoscience in the last years. In this work, we study the properties of a two-dimensional photonic crystal composed of dielectric rods. The unit cell of the system is composed of six rods organized on the sites of a C6 triangular lattice. We induce a topological phase by introducing an angular perturbation ϕ in the pristine system. The topology of the system is then determined by using the so-called k.p perturbed model. Our results show that the system presents a topological and a trivial phase, depending on the sign of the angular perturbation ϕ. The topological character of the system is probed by evaluating the electromagnetic energy density and analyzing its distribution in the real space, in particular on the maximal Wyckoff points. We also find two edge modes at the interface between the trivial and topological photonic crystals, which present a pseudospin topological behavior. By applying the bulk-edge correspondence, we study the pseudospin edge modes and conclude that they are robust against defects, disorder and reflection. Moreover, the localization of the edge modes leads to the confinement of light and the interface behaves as a waveguide for the propagation of electromagnetic waves. Finally, we show that the two edge modes present energy flux propagating in opposite directions, which is the photonic analogue of the quantum spin Hall effect. Full article
(This article belongs to the Special Issue Photonics: Theory, Technologies and Applications)
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12 pages, 3177 KiB  
Communication
Focusing of Radially Polarized Electromagnetic Waves by a Parabolic Mirror
by Zerihun Tadele Godana, János Hebling and László Pálfalvi
Photonics 2023, 10(7), 848; https://doi.org/10.3390/photonics10070848 - 21 Jul 2023
Cited by 2 | Viewed by 1639
Abstract
It is well-known that a strong longitudinal electric field and a small spot size are observed when radially polarized beams are tightly focused using a high numerical aperture parabolic mirror. The longitudinal electric field component can accelerate electrons along the propagation axis at [...] Read more.
It is well-known that a strong longitudinal electric field and a small spot size are observed when radially polarized beams are tightly focused using a high numerical aperture parabolic mirror. The longitudinal electric field component can accelerate electrons along the propagation axis at high intensities in the focal region, which opens an application in particle acceleration. In this paper, we present a rigorous derivation of the electric field obtained when a radially polarized, monochromatic, flat-top beam is focused by a parabolic mirror. The formulae were deduced from the Stratton–Chu integral known from vector diffraction theory. We examined the influence of the focusing parameters on the distribution of both the longitudinal and radial electric field components. In the small numerical aperture and short wavelength regimes, excellent agreement was found with the results obtained from the Rayleigh–Sommerfeld formula. The calculation method can be adapted for various beam types and for electromagnetic pulses as well. Full article
(This article belongs to the Special Issue Photonics: Theory, Technologies and Applications)
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