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Advances in Optical and Photonic Materials
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Advances in Optical and Photonic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 1636

Special Issue Editor

Prof. Dr. Weili Zhang

grade E-Mail Website
Guest Editor
School of Electrical and Computer Engineering, Oklahoma State University, 200 Engineering South, Stillwater, OK 74078, USA
Interests: terahertz optoelectronics; terahertz spectroscopy; ultrafast phenomena; optics of micro- and nanostructured materials; semiconductor photonics

Special Issue Information

Dear Colleagues,

This Special Issue aims to explore the latest advancements in optical and photonic materials, with a focus on innovative developments that enhance performance and expand potential applications. We invite contributions that address key areas in the field, including the following:

  • Subwavelength photonics: This area encompasses micro- and nanoscale metamaterials and metasurfaces, two-dimensional materials, and plasmonic geometries. Research in this area is critical for manipulating light at scales smaller than its wavelength, paving the way for breakthroughs in imaging, sensing, and device fabrication.
  • Quantum photonics: We highly encourage submissions focused on quantum phenomena in photonic systems. Topics may include investigations into quantum materials, light–matter interactions at the quantum level, and applications in quantum communication and computing.
  • Biophotonics: We welcome contributions that explore the use of optical and photonic materials in biological contexts. This area covers topics ranging from biomedical imaging and diagnostics to therapeutic applications, with an emphasis on how advances in materials science can transform healthcare.

We look forward to receiving high-quality manuscripts that contribute to the growing body of knowledge in these dynamic fields, driving innovation and fostering collaboration among researchers and practitioners in optics and photonics.

Prof. Dr. Weili Zhang
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. Materials is an international peer-reviewed open access semimonthly 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
  • photonic materials
  • subwavelength photonics
  • quantum photonics
  • biophotonics

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

Published Papers (3 papers)

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Research

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19 pages, 8571 KiB  
Article
Molecular Diffusion and Optical Properties of Implantable Collagen Materials
by Sofya V. Atsigeida, Daria K. Tuchina, Peter S. Timashev and Valery V. Tuchin
Materials 2025, 18(5), 1035; https://doi.org/10.3390/ma18051035 - 26 Feb 2025
Viewed by 330
Abstract
The effects of optical clearing of implantable collagen materials were studied using optical clearing agents (OCAs) based on aqueous glucose solutions of various concentrations. By measuring the kinetics of the collimated transmission spectra, the diffusion D and permeability P coefficients of the OCAs [...] Read more.
The effects of optical clearing of implantable collagen materials were studied using optical clearing agents (OCAs) based on aqueous glucose solutions of various concentrations. By measuring the kinetics of the collimated transmission spectra, the diffusion D and permeability P coefficients of the OCAs of collagen materials were determined as D = (0.22 ± 0.05) × 10−6 to (1.41 ± 0.05) × 10−6 cm2/c and P = (0.55 ± 0.04) × 10−4 to (1.77 ± 0.07) × 10−4 cm/c. Studies with optical coherence tomography (OCT) confirmed that each of the OCAs used had an effect on the optical properties of collagen materials, and allowed us to quantify the group refractive indices of the collagen of various samples, which turned out to be in the range from nc = 1.476 to nc = 1.579. Full article
(This article belongs to the Special Issue Advances in Optical and Photonic Materials)
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14 pages, 1943 KiB  
Article
High-Temperature Optoelectronic Transport Behavior of n-TiO2 Nanoball–Stick/p-Lightly Boron-Doped Diamond Heterojunction
by Shunhao Ge, Dandan Sang, Changxing Li, Yarong Shi, Cong Wang, Chunshuai Yu, Guangyu Wang, Hongzhu Xi and Qinglin Wang
Materials 2025, 18(2), 303; https://doi.org/10.3390/ma18020303 - 10 Jan 2025
Viewed by 958
Abstract
The n-TiO2 nanoballs–sticks (TiO2 NBSs) were successfully deposited on p-lightly boron-doped diamond (LBDD) substrates by the hydrothermal method. The temperature-dependent optoelectronic properties and carrier transport behavior of the n-TiO2 NBS/p-LBDD heterojunction were investigated. The photoluminescence (PL) of the heterojunction detected [...] Read more.
The n-TiO2 nanoballs–sticks (TiO2 NBSs) were successfully deposited on p-lightly boron-doped diamond (LBDD) substrates by the hydrothermal method. The temperature-dependent optoelectronic properties and carrier transport behavior of the n-TiO2 NBS/p-LBDD heterojunction were investigated. The photoluminescence (PL) of the heterojunction detected four distinct emission peaks at 402 nm, 410 nm, 429 nm, and 456 nm that have the potential to be applied in white-green light-emitting devices. The results of the I-V characteristic of the heterojunction exhibited excellent rectification characteristics and good thermal stability at all temperatures (RT-200 °C). The forward bias current increases gradually with the increase in external temperature. The temperature of 150 °C is ideal for the heterojunction to exhibit the best electrical performance with minimum turn-on voltage (0.4 V), the highest forward bias current (0.295 A ± 0.103 mA), and the largest rectification ratio (16.39 ± 0.005). It is transformed into a backward diode at 200 °C, which is attributed to a large number of carriers tunneling from the valence band (VB) of TiO2 to the conduction band (CB) of LBDD, forming an obvious reverse rectification effect. The carrier tunneling mechanism at different temperatures and voltages is analyzed in detail based on the schematic energy band structure and semiconductor theoretical model. Full article
(This article belongs to the Special Issue Advances in Optical and Photonic Materials)
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Review

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40 pages, 4806 KiB  
Review
On the Origin of Thermally Enhanced Upconversion Luminescence in Lanthanide-Doped Nanosized Fluoride Phosphors
by Shirun Yan
Materials 2025, 18(12), 2700; https://doi.org/10.3390/ma18122700 - 8 Jun 2025
Abstract
Thermally enhanced upconversion luminescence (UCL), also known as negative thermal quenching of UCL, denotes a continuous increase in the UCL emission intensity of a particular phosphor with a rising temperature. In recent years, the thermal enhancement of UCL has attracted extensive research attention, [...] Read more.
Thermally enhanced upconversion luminescence (UCL), also known as negative thermal quenching of UCL, denotes a continuous increase in the UCL emission intensity of a particular phosphor with a rising temperature. In recent years, the thermal enhancement of UCL has attracted extensive research attention, with numerous reports detailing this effect in phosphors characterized by varying particle sizes, architectures, and compositions. Several hypotheses have been formulated to explain the underlying mechanisms driving this thermal enhancement. This paper rigorously examines thermally enhanced UCL in fluoride nanoparticles by addressing two key questions: (1) Is the thermal enhancement of UCL an intrinsic feature of these nanoparticles? (2) Can the proposed mechanisms explaining this enhancement be unequivocally supported by the existing literature? Upon analyzing a compilation of experimental observations alongside the concurrent phenomena occurred during spectral measurements, it is postulated that thermally enhanced UCL intensity is likely a consequence of multiple extrinsic factors operating simultaneously at elevated temperatures, rather than being an intrinsic property of nanoparticles. These factors include moisture desorption, laser-induced local heating, and lattice thermal expansion. The size-dependent properties of nanoparticles, such as surface-to-volume ratio, thermal expansion coefficient, and quantum yield, are the fundamental reasons for the size-dependent thermal enhancement factor of UCL. Temperature-dependent emission spectral intensity is not a dependable indicator for assessing the thermal quenching properties of phosphors. This is because it is influenced not only by the phosphor’s quantum yield, but also by various extrinsic factors at high temperatures. The nonlinear nature of UCL further magnifies the impact of these extrinsic factors. Full article
(This article belongs to the Special Issue Advances in Optical and Photonic Materials)
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