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Optical Thin Films and Coatings: Synthesis, Characterisation and Applications
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Optical Thin Films and Coatings: Synthesis, Characterisation and Applications

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

Deadline for manuscript submissions: 10 November 2024 | Viewed by 2698

Special Issue Editors

Dr. Marcio Peron Franco de Godoy

E-Mail Website1 Website2
Guest Editor
Associate Professor, Physics Department, Universidade Federal de São Carlos (UFSCar), São Carlos, Brazil
Interests: thin-film technologies; oxides; polymers; photoluminescence; atmosphere-related phenomena; interfaces
Dr. Marcelos Lima Peres

E-Mail Website1 Website2
Guest Editor
Associate Professor, Instituto de Física e Química, Universidade Federal de Itajuba, Itajubá, Brazil
Interests: magnetotransport and photoconductvity phenomena in nanostructures;topological insulators; topologial semimetals; IV-VI elements

Special Issue Information

Dear Colleagues,

Thin-film technology revolutionized modern life by enabling compact optoelectronic devices and smart coatings. Current applications include understanding the substrate conformation and crystal structure of thin films during synthesis processes and their correlation to physical and chemical properties, particularly to optical-related phenomena. The control and use of light emission and/or absorption and light guiding provide interesting insights that are suitable for photonics, sensing or detecting applications. In addition, optical materials present new fundamental issues and functional properties under extreme conditions, such as low/high temperatures, electric and magnetic fields, or by controlling dimensionality.

This Special Issue focuses on the advances in the synthesis, characterization and application of optical thin films and coatings. Original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Novel thin-film and coating fabrication methods;
  • Rare-earth-doped thin films and coatings;
  • Defect-related emission/absorption and optical matching;
  • Organic, inorganic, smart, and 2D luminescent materials; 
  • Light-assisted electronic transport;
  • Wave-guide innovations;
  • Quantum interference and spin-orbit coupling effects;
  • Electric transport in 2D electron/hole gases at interfaces;
  • Phenomena under extreme environmental conditions, such as low/high temperatures and high magnetic fields.

We look forward to receiving your contributions!

Dr. Marcio Peron Franco de Godoy
Dr. Marcelos Lima Peres
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. 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 materials
  • thin-film devices
  • smart coatings
  • photoconduction
  • extreme conditions

Published Papers (3 papers)

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Research

15 pages, 3605 KiB  
Article
Exploring Na Doping in ZnO Thin Films: Electrical and Optical Insights
by Ana Luiza C. Silva, Luis M. B. Vargas, Marcelos L. Peres, Marcio D. Teodoro and Marcio P. F. de Godoy
Coatings 2024, 14(4), 510; https://doi.org/10.3390/coatings14040510 - 19 Apr 2024
Viewed by 418
Abstract
Strategies to achieve p-type behavior in semiconductor oxides are an important current topic of research. Our study showed that sodium-doped zinc oxide thin films are a plausible approach. The insertion of dopant allowed a transition between n-type p-type electrical behavior in specific temperature [...] Read more.
Strategies to achieve p-type behavior in semiconductor oxides are an important current topic of research. Our study showed that sodium-doped zinc oxide thin films are a plausible approach. The insertion of dopant allowed a transition between n-type p-type electrical behavior in specific temperature ranges around 300 K. Annealing procedures under controlled atmospheres, including Ar, N2, and O2, increased the hole density up to a magnitude of 1016 cm−3, although this also reduced the window temperature. The micro-photoluminescence spectra showed an enhancement of defect-related emissions as the dopant content increased. Notably, yellow-green emissions (around 2.38 eV–520 nm) were the most prominent in the as-grown samples. After annealing, a strong redshift of the defect band was observed (around 1.85 eV–670 nm). Our findings showed that p-type ZnO:Na films exhibited emissions associated with RGB primary colors. In a chromaticity diagram, as-grown samples appeared near the white range, annealed films were close to the warm white area, and O2 annealed films trended within the red range. Full article
(This article belongs to the Special Issue Optical Thin Films and Coatings: Synthesis, Characterisation and Applications)
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10 pages, 5999 KiB  
Article
NIR to LWIR Dichroic Beamsplitter Designed and Manufactured for Space Optical Remote Sensor
by Lin Jiang, Yang Qin, Tianyan Yu, Weibo Duan and Dingquan Liu
Coatings 2024, 14(2), 235; https://doi.org/10.3390/coatings14020235 - 18 Feb 2024
Viewed by 764
Abstract
The infrared dichroic beamsplitter plays an important role in infrared multi-band imaging systems, especially for infrared remote sensing. This paper presents the design and preparation of a dichroic beamsplitter that is capable of reflecting near infrared (NIR) and shortwave infrared (SWIR), and transmitting [...] Read more.
The infrared dichroic beamsplitter plays an important role in infrared multi-band imaging systems, especially for infrared remote sensing. This paper presents the design and preparation of a dichroic beamsplitter that is capable of reflecting near infrared (NIR) and shortwave infrared (SWIR), and transmitting medium wave infrared (MWIR) as well as longwave infrared (LWIR). A single crystal germanium (Ge) sheet is used as the substrate of the dichroic beamsplitter, while Ge, zinc sulfide (ZnS) and ytterbium trifluoride (YbF3) are selected as coating materials. The average reflectance of the dichroic beamsplitter is more than 95% in bands 1.28 to 1.38 μm, 1.58 to 1.83 μm, and 1.95 to 2.32 μm, and the average transmittance is more than 92% in bands 3.7 to 6.2 μm and 7.5 to 12.5 μm at an incident angle of 45°. The dichroic beamsplitter has been successfully applied in the optical system of infrared remote sensing. It provides a technical approach for other optical systems to separate the optical spectrum from NIR to LWIR. Full article
(This article belongs to the Special Issue Optical Thin Films and Coatings: Synthesis, Characterisation and Applications)
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11 pages, 695 KiB  
Article
Thickness-Dependent Terahertz Permittivity of Epitaxially Grown PbTe Thin Films
by Nicolas M. Kawahala, Daniel A. Matos, Paulo H. O. Rappl, Eduardo Abramof, Andrey Baydin, Junichiro Kono and Felix G. G. Hernandez
Coatings 2023, 13(11), 1855; https://doi.org/10.3390/coatings13111855 - 28 Oct 2023
Viewed by 945
Abstract
The exceptional thermoelectric properties of PbTe are believed to be associated with the incipient ferroelectricity of this material, which is caused by strong electron–phonon coupling that connects phononic and electronic dynamics. Here, we have used terahertz time-domain spectroscopy measurements to generate complex permittivity [...] Read more.
The exceptional thermoelectric properties of PbTe are believed to be associated with the incipient ferroelectricity of this material, which is caused by strong electron–phonon coupling that connects phononic and electronic dynamics. Here, we have used terahertz time-domain spectroscopy measurements to generate complex permittivity spectra for a set of epitaxially grown PbTe thin films with thicknesses between 100 nm and 500 nm at temperatures from 10 K to 300 K. Using a Drude–Lorentz model, we retrieved the physical parameters of both the phononic and electronic contributions to the THz permittivity. We observed a strong decrease, or softening, of the transverse optical phonon mode frequency with decreasing temperature, determining a thickness-independent negative ferroelectric-transition critical temperature, while we found a thickness-dependent anharmonic phonon decay lifetime. The electronic contribution to the permittivity was larger in thinner films, and both the carrier density and mobility increased with decreasing temperature in all films. Finally, we detected a thickness-dependent longitudinal optical phonon mode frequency, indicating the presence of plasmon–phonon coupling. Full article
(This article belongs to the Special Issue Optical Thin Films and Coatings: Synthesis, Characterisation and Applications)
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