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Coatings
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Thin Films and Surface Optics
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Thin Films and Surface Optics

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 12474

Special Issue Editor

Prof. Dr. Zigmas Balevičius

E-Mail Website
Guest Editor
Plasmonics and Nanophotonics Lab., Department of Laser Technology, Center for Physical Science and Technology, Vilnius, Lithuania
Faculty of Electronics, Vilnius Gediminas Technical University, Vilnius, Lithuania
Interests: : surface spectroscopy; plasmonics; surface electromagnetic waves; resonant optical effects on the surfaces and interfaces; light–mater interaction; spectroscopic ellipsometry; photonic crystals; optical gas and biosensing

Special Issue Information

Dear Colleagues,

The scientific journal MDPI Coatings would like to invite you to submit your latest research for publication in a Special Issue on “Thin Films and Surface Optics”. Technological progress in the manufacturing of high-accuracy nanometric thin film structures and nanotextured surfaces has led to their application in many fields of science and technology. The characterization of their optical properties and the design of thin film structures with the desired optical parameters has opened up new possibilities for the management of light in such structures and the development of new optical devices in various fields of optics. This Special Issue will be devoted to all kinds of optical characterizations and applications of such thin films and surfaces. The optics of such thin films and their structures have a wide range of applications, beginning from coatings up to

the creation of sophisticated optical elements for lasers, plasmonics, integrated optical circuits, optical nanosensors, and many other uses. The aim of this Special Issue is to present the latest experimental and theoretical studies in the field of thin films and surface optics as presented in original research papers and review articles. Topics include but are not limited to studies of thin films and surface optical properties in the fields of:

  • Novel materials for optical thin films;
  • Surface and interface optics;
  • Thin films for lasers;
  • Optical filters;
  • LEDs;
  • Engineered structures for optics;
  • Fiber optics and optical communications;
  • Plasmonics and other surface electromagnetic waves;
  • Photonic crystals;
  • Optical detectors and sensors for gas, biosensing, and other materials;
  • Diffractive and guided optics;
  • Optical data storage;
  • Biophotonics and optics for medicine.

Prof. Dr. Zigmas Balevičius
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.

Published Papers (4 papers)

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Research

14 pages, 3994 KiB  
Article
Wavelength-Selective Coatings on Glass with High Hardness and Damage Resistance
by Karl W. Koch, Lin Lin, James J. Price, Chang-Gyu Kim, Dong-Gun Moon, Sang-Yoon Oh, Jung-Keun Oh, Jeong-Hong Oh, Charles A. Paulson, Binwei Zhang, Ananth Subramanian, Alexandre Mayolet, Carlo Kosik Williams and Shandon D. Hart
Coatings 2020, 10(12), 1247; https://doi.org/10.3390/coatings10121247 - 17 Dec 2020
Cited by 5 | Viewed by 2428
Abstract
Wavelength-selective coatings are broadly applied across diverse industries such as solar energy management, infrared sensing, telecommunications, laser optics, and eye-protective lenses. These coatings have historically not been optimized for hardness or mechanical durability and typically suffer from higher susceptibility to scratch and damage [...] Read more.
Wavelength-selective coatings are broadly applied across diverse industries such as solar energy management, infrared sensing, telecommunications, laser optics, and eye-protective lenses. These coatings have historically not been optimized for hardness or mechanical durability and typically suffer from higher susceptibility to scratch and damage events than uncoated glass. In this work, we describe a family of wavelength-selective coatings with hardness and scratch resistance that are significantly higher than the chemically strengthened glass substrates on which the coatings are fabricated. The coatings are made using industrially scalable reactive sputtering methods. Wavelength-selective coatings are fabricated with nanoindentation hardness as high as 16–20 GPa over indentation depths ranging from 200 to 800 nm, as well as excellent durability in aggressive scratch testing. Tunable visible to near-infrared wavelength selectivity ratios (reflectance of stopband: reflectance of passband) as high as 7:1 are achieved. The feasibility of narrowband hard coating design is also demonstrated, with visible narrowband transmission having a peak FWHM of ~8 nm (~1.6%). A unique “buried layers” hard coating design strategy is shown to deliver particularly excellent hardness profiles. These designs can be tailored for a variety of different wavelengths and selectivity ratios, enabling new uses of wavelength-selective optics in mechanically demanding applications. Full article
(This article belongs to the Special Issue Thin Films and Surface Optics)
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10 pages, 3130 KiB  
Article
Formation and Photoluminescence Properties of ZnO Nanoparticles on Electrospun Nanofibers Produced by Atomic Layer Deposition
by Valerii Myndrul, Lucie Vysloužilová, Andrea Klápšťová, Emerson Coy, Mariusz Jancelewicz and Igor Iatsunskyi
Coatings 2020, 10(12), 1199; https://doi.org/10.3390/coatings10121199 - 09 Dec 2020
Cited by 14 | Viewed by 2537
Abstract
The unique combination of optical, chemical, and structural properties of one-dimensional zinc oxide (1D ZnO) makes it one of the most attractive materials in a wide range of research and applications. In the present study, 1D ZnO nanomaterials were fabricated using a combination [...] Read more.
The unique combination of optical, chemical, and structural properties of one-dimensional zinc oxide (1D ZnO) makes it one of the most attractive materials in a wide range of research and applications. In the present study, 1D ZnO nanomaterials were fabricated using a combination of two independent methods: electrospinning and atomic layer deposition (ALD). The electrospinning technique was used to produce 1D electrospun fibers consisting of four types of polymers: polylactic acid (PLLA), polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), and polyamide 6 (PA6). The ALD technology, in turn, was selected as an excellent candidate for the synthesis of a ZnO thin layer over polymer fibers for the production of 1D ZnO/polymer nanofiber composites (PLLA/ZnO, PVDF/ZnO, PVA/ZnO, PA6/ZnO). Structural and optical properties of the produced nanofibers were studied by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), diffuse reflectance, and photoluminescence (PL) spectroscopy. It was found that only PVDF/ZnO nanofibers exhibit stable room temperature PL that may be the result of a higher ZnO content in the sample. In addition, PL measurements were conducted as a function of excitation power and temperature in order to establish the main PL mechanisms and parameters for the PVDF/ZnO sample, as a most promising candidate for the biophotonic application. Full article
(This article belongs to the Special Issue Thin Films and Surface Optics)
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10 pages, 3980 KiB  
Article
Strong Coupling between Tamm and Surface Plasmons for Advanced Optical Bio-Sensing
by Zigmas Balevičius
Coatings 2020, 10(12), 1187; https://doi.org/10.3390/coatings10121187 - 05 Dec 2020
Cited by 22 | Viewed by 3779
Abstract
The total internal reflection ellipsometry method was used to analyse the angular spectra of the hybrid Tamm and surface plasmon modes and to compare their results with those obtained using the conventional single SPR method. As such type of measurement is quite common [...] Read more.
The total internal reflection ellipsometry method was used to analyse the angular spectra of the hybrid Tamm and surface plasmon modes and to compare their results with those obtained using the conventional single SPR method. As such type of measurement is quite common in commercial SPR devices, more detailed attention was paid to the analysis of the p-polarization reflection intensity dependence. The conducted study showed that the presence of strong coupling in the hybrid plasmonic modes increases the sensitivity of the plasmonic-based sensors due to the reduced losses in the metal layer. The experimental results and analysis of the optical responses of three different plasmonic-based samples indicated that the optimized Tamm plasmons ΔRp(TP) and optimized surface plasmons ΔRp(SP) samples produce a response that is about five and six times greater than the conventional surface plasmon resonance ΔRp(SPR) in angular spectra. The sensitivity of the refractive index unit of the spectroscopic measurements for the optimized Tamm plasmon samples was 1.5 times higher than for conventional SPR, while for wavelength scanning, the SPR overcame the optimized TP by 1.5 times. Full article
(This article belongs to the Special Issue Thin Films and Surface Optics)
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10 pages, 1408 KiB  
Article
Porous Aluminium Oxide Coating for the Development of Spectroscopic Ellipsometry Based Biosensor: Evaluation of Human Serum Albumin Adsorption
by Vincentas Maciulis, Uldis Malinovskis, Donats Erts, Arunas Ramanavicius, Almira Ramanaviciene, Saulius Balevicius, Silvija Juciute and Ieva Plikusiene
Coatings 2020, 10(11), 1018; https://doi.org/10.3390/coatings10111018 - 23 Oct 2020
Cited by 12 | Viewed by 3019
Abstract
An electrochemically synthesised porous anodic aluminium oxide (pAAO) layer has been analysed by means of spectroscopic ellipsometry. The determined thickness of the formed pAAO layer obtained from spectroscopic ellipsometry measurements and modelling was 322.75 ± 0.12 nm. The radius of the nanopores estimated [...] Read more.
An electrochemically synthesised porous anodic aluminium oxide (pAAO) layer has been analysed by means of spectroscopic ellipsometry. The determined thickness of the formed pAAO layer obtained from spectroscopic ellipsometry measurements and modelling was 322.75 ± 0.12 nm. The radius of the nanopores estimated from SEM images was 39 ± 5 nm and the distance between nanopores was 107 ± 6 nm. The investigation of human serum albumin (HSA) adsorption on the pAAO coating showed that: (i) the protein concentration inside nanopores, depending on exposure time, approximately was from 200 up to 600 times higher than that determined in buffer solution; (ii) the initial phase of the adsorption process is slow (3.23 mg·cm−3·min−1) in comparison with the protein desorption rate (21.2 mg·cm−3·min−1) by means of pAAO layer washing; (iii) conventional washing with PBS solution and deionised water does not completely remove HSA molecules from pAAO pores and, therefore, the HSA concentration inside nanopores after 16 h of washing still remains almost 100 times higher than that present in PBS solution. Thus, due to such binding ability, HSA can be successfully used for the blocking of the remaining free surface, which is applied for the reduction in non-specific binding after the immobilisation of biorecognition molecules on the pAAO surface. It was determined that some desorption of HSA molecules from the pAAO layer occurred during the sensor’s surface washing step; however, HSA concentration inside the nanopores still remained rather high. These results recommend the continued application of pAAO in the development of biosensors. Full article
(This article belongs to the Special Issue Thin Films and Surface Optics)
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