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Optical Properties of Crystals and Thin Films, Volume II
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Optical Properties of Crystals and Thin Films, Volume II

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (31 March 2025) | Viewed by 6323

Special Issue Editor

Dr. Piotr Potera

E-Mail Website
Guest Editor
Institute of Engineering Materials, University of Rzeszow, Pigonia 1, 35-310 Rzeszow, Poland
Interests: absorption and reflection spectroscopy of solids and thin films; radiation defects in laser materials and materials for optoelectronics; influence of heat treatment and irradiation on optical properties of materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Following the successful first edition "Optical Properties of Crystals and Thin Films", we are pleased to announce that submissions to the upcoming Special Issue of Coatings, entitled "Optical Properties of Crystals and Thin Films, Volume II", are now being accepted.

The optical properties of crystals and layers provide rich information on such diverse aspects of their physical properties as their electronic and vibrational states and the existence and nature of defects and impurities. In the particular case of layers, some optical techniques provide information about their structure and quality (layer thicknesses, etc.). The optical properties of crystals and thin layers are also especially important from the point of view of their practical applications (active media of solid-state lasers, optical materials, active layers, etc.). The optical properties of materials may be influenced by a number of external factors, such as temperature, ionizing radiation and others. The study of the influence of these factors on the optical properties of crystals and thin layers allows for the determination of many interesting properties. For example, irradiation of laser crystals with ionizing radiation leads to increased absorption and degradation of generation characteristics. Heating the irradiated crystals under appropriate conditions (time, temperature, atmosphere) usually leads to an improvement in their generation parameters and a decrease in their absorption.

In particular, the topics of interest in this Special Issue include, but are not limited to:

  • Optical spectroscopy of crystals and thin films (e.g., transmission, absorption, reflection);
  • Determination of the optical band gap energy and Urbach tail of crystals and layers;
  • The use of Swanepoel's method for determining the refractive index and thickness of thin layers;
  • Luminescence of crystals (mainly photoluminescence and thermoluminescence);
  • Effects of external influences (irradiation, thermal treatment, etc.) on the optical properties of crystals and layers;
  • Optical properties of thin films for various applications (in solar cells, in light-emitting devices, etc.);
  • Optical properties of laser crystals.

Dr. Piotr Potera
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. Coatings 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 2600 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.

Keywords

  • optical spectroscopy
  • absorption
  • luminescence
  • reflection
  • thin films
  • crystals

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Published Papers (6 papers)

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Research

17 pages, 15972 KiB  
Article
Structure and Properties of Silver-Platinum-Titanium Dioxide Nanocomposite Coating
by Andrzej Dziedzic, Dariusz Augustowski, Paweł Kwaśnicki, Stanisław Adamiak, Wojciech Bochnowski, Anna Żaczek, Patrycja Skała, Bogumił Cieniek, Piotr Potera, Jakub Dziedzic, Małgorzata Kus-Liskiewicz and Dariusz Płoch
Coatings 2025, 15(5), 587; https://doi.org/10.3390/coatings15050587 - 15 May 2025
Abstract
The aim of this study was to produce a coating for protective glass glued to touch displays with high antibacterial effectiveness. This paper presents the structural, mechanical, optical, and antibacterial properties of a TiO2:Ag–Pt coating prepared by dual reactive DC and [...] Read more.
The aim of this study was to produce a coating for protective glass glued to touch displays with high antibacterial effectiveness. This paper presents the structural, mechanical, optical, and antibacterial properties of a TiO2:Ag–Pt coating prepared by dual reactive DC and RF magnetron sputtering. Characterization techniques used include XRD, TEM with EDS, SEM, AFM, nanoindentation for hardness and Young’s modulus, wettability tests, and optical property analysis. The coating exhibited columnar crystals with a width of 30–50 nm. Crystals of anatase, rutile, silver, and platinum with a size of up to 3 nm were identified. The coating deposited on glass had a concentration of 5.0 ± 0.2% at. Ag and 4.4 ± 0.1% at. Pt. The value of the optical band gap energy, corresponding to the direct transition, was 3.36 eV, while Urbach’s energy was in the order of 500 meV. The hydrophilic coating had a roughness RMS = 1.8 ± 0.2 nm, hardness HV = 6.8 ± 0.5 GPa, and Young’s modulus E = 116 ± 8 GPa. A unique combination of the phase composition of the TiO2:Ag–Pt coating, metallic Ag and Pt nanoparticles in a ceramic matrix of anatase and rutile crystallites resulted a >90% reduction of Staphylococcus aureus bacteria. This antibacterial effect was attributed to the activation of the doped semiconductor under visible light via plasmon resonance of the Ag and Pt nanoparticles, as well as a light-independent antibacterial action due to Ag+ ion release. In contrast, commercial antibacterial coatings typically achieve only around 60% bacterial reduction. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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11 pages, 1736 KiB  
Article
Controllable Goos-Hänchen Shift in Photonic Crystal Heterostructure Containing Anisotropic Graphene
by Haishan Tian, Huabing Wang, Jingke Zhang and Gang Sun
Coatings 2024, 14(9), 1092; https://doi.org/10.3390/coatings14091092 - 26 Aug 2024
Viewed by 1059
Abstract
In this study, we investigate the electrically and magnetically tunable Goos–Hänchen (GH) shift of a reflected light beam at terahertz frequencies. Our study focuses on a photonic crystal heterostructure incorporating a monolayer anisotropic graphene. We observe a tunable and enhanced GH shift facilitated [...] Read more.
In this study, we investigate the electrically and magnetically tunable Goos–Hänchen (GH) shift of a reflected light beam at terahertz frequencies. Our study focuses on a photonic crystal heterostructure incorporating a monolayer anisotropic graphene. We observe a tunable and enhanced GH shift facilitated by a drastic change in the reflected phase at the resonance angle owing to the excitation of the topological edge state. Considering the quantum response of graphene, we demonstrate the ability to switch positive and negative GH shifts through the manipulation of graphene’s conductivity properties. Moreover, we show that the GH shift can be actively tuned by the external electric field and magnetic field, as well as by controlling the structural parameters of the system. We believe that this tunable and enhanced GH shift scheme offers excellent potential for preparing terahertz shift devices. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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11 pages, 3023 KiB  
Article
Optical Bistability Based on MoS2 in the Kretschmann–Raether Configuration at Visible Light Frequencies
by Haishan Tian, Songqing Tang, Leyong Jiang, Huabing Wang, Jingke Zhang and Gang Sun
Coatings 2024, 14(8), 1070; https://doi.org/10.3390/coatings14081070 - 21 Aug 2024
Viewed by 782
Abstract
In this study, we theoretically study the optical bistability (OB) of reflected light beams at visible light frequencies by using a Kretschmann–Raether (KR) configuration where double-layer MoS2 is inserted. This OB phenomenon results from the local field enhancement owing to the excitation [...] Read more.
In this study, we theoretically study the optical bistability (OB) of reflected light beams at visible light frequencies by using a Kretschmann–Raether (KR) configuration where double-layer MoS2 is inserted. This OB phenomenon results from the local field enhancement owing to the excitation of metal surface plasmon polaritons (SPPs) and the introduction of the double-layer MoS2. By considering the third-order conductivity of MoS2, we obtain a threshold electric field with an incident electric field of 107 V/m levels. Furthermore, the influences of the structural parameters on the hysteretic behavior as well as the threshold of OB are clarified. This tunable OB phenomenon will provide possible options for nonlinear optical bistable devices. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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9 pages, 2509 KiB  
Article
Tunable Nonlinear Optical Bistability Based on the Fabry–Perot Cavity Composed of Dirac Semimetal and Two Symmetric Photonic Crystals
by Yunyang Ye, Jing Pan, Wei Chen, Huayue Zhang and Riwei Wang
Coatings 2024, 14(6), 705; https://doi.org/10.3390/coatings14060705 - 4 Jun 2024
Cited by 1 | Viewed by 1075
Abstract
In this paper, we study the nonlinear optical bistability (OB) in a symmetrical multilayer structure. This multilayer structure is constructed by embedding a nonlinear three-dimensional Dirac semimetal (3D DSM) into a Fabry–Perot cavity composed of one-dimensional photonic crystals. The OB phenomenon stems from [...] Read more.
In this paper, we study the nonlinear optical bistability (OB) in a symmetrical multilayer structure. This multilayer structure is constructed by embedding a nonlinear three-dimensional Dirac semimetal (3D DSM) into a Fabry–Perot cavity composed of one-dimensional photonic crystals. The OB phenomenon stems from the third order nonlinear conductivity of 3D DSM. The local field of resonance mode could enhance the nonlinearity and reduce the thresholds of OB. This structure achieves the tunability of OB due to the fact that the transmittance could be modulated by the Fermi energy. It is found that the OB threshold and threshold width could be remarkably reduced by increasing the Fermi energy of the 3D DSM. Besides, we also found that the OB curve depends heavily on the angle of incidence of the incident light, the structural parameters of the Fabry–Perot cavity, and the position of the 3D DSM inside the cavity. After parameter optimization, we obtained OB with a threshold of 106 V/m. We believe this simple multilayer structure could provide a reference idea for realizing low-threshold and tunable all-optical switching devices. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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10 pages, 3154 KiB  
Article
Nonlinear Optical Bistability Based on Surface Plasmons with Nonlinear Dirac Semimetal Substrate
by Xinghua Wu, Yanyan Guo, Xin Long and Qingkai Wang
Coatings 2024, 14(4), 394; https://doi.org/10.3390/coatings14040394 - 27 Mar 2024
Cited by 2 | Viewed by 1308
Abstract
In this paper, we theoretically investigated the low-threshold and controllable optical bistability (OB) of a graphene-based Otto configuration with a nonlinear three-dimensional Dirac semimetal (3D DSM) as the substrate. The combined effect of the excitation of surface plasmon polaritons (SPPs) in graphene and [...] Read more.
In this paper, we theoretically investigated the low-threshold and controllable optical bistability (OB) of a graphene-based Otto configuration with a nonlinear three-dimensional Dirac semimetal (3D DSM) as the substrate. The combined effect of the excitation of surface plasmon polaritons (SPPs) in graphene and the very high third-order nonlinear conductivity of the 3D DSM enabled this scheme to achieve a relatively low optical bistability threshold. At the same time, this simple multilayer structure showed the tunability of OB due to the fact that the reflectance could be modulated by regulating the Fermi energy of the 3D DSM. Furthermore, we also found that the OB hysteresis curve was closely related to the relaxation time of the 3D DSM and the thickness of the air layer. We believe that this multilayer configuration could provide a reference idea for devising a bistable device. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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12 pages, 2298 KiB  
Article
Magnetically Tunable Goos–Hänchen Shift of Reflected Beam in Multilayer Structures Containing Anisotropic Graphene
by Yunyang Ye, Xinye Zhang and Leyong Jiang
Coatings 2023, 13(10), 1763; https://doi.org/10.3390/coatings13101763 - 13 Oct 2023
Cited by 2 | Viewed by 1370
Abstract
In this paper, the magnetically tunable Goos–Hänchen (GH) shift of a reflected beam at terahertz frequencies is achieved by using a multilayer structure where three layers of anisotropic graphene are inserted. The enhanced GH shift phenomenon results from the local field enhancement owing [...] Read more.
In this paper, the magnetically tunable Goos–Hänchen (GH) shift of a reflected beam at terahertz frequencies is achieved by using a multilayer structure where three layers of anisotropic graphene are inserted. The enhanced GH shift phenomenon results from the local field enhancement owing to the excitation of graphene surface plasmon polaritons at the interface between two dielectric materials. By considering the quantum response of graphene, the GH shift can be switched from negative to positive by harnessing the anisotropic conductivity of graphene, and the GH shift can be actively tuned through the external magnetic field or by controlling the structural parameters. By setting appropriate magnetic field and structural parameters, we can obtain GH values of −140 microns to 220 microns in the terahertz band. This enhanced and tunable GH shift is promising for fabricating graphene-based terahertz shift devices and other applications in nanophotonics. Full article
(This article belongs to the Special Issue Optical Properties of Crystals and Thin Films, Volume II)
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