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Advances in Electronic and Optical Properties of Nanostructured Materials
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Advances in Electronic and Optical Properties of Nanostructured Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 8735

Special Issue Editor

Dr. Thierry Baron

E-Mail Website
Guest Editor
Universite Grenoble Alpes, Grenoble, France
Interests: nanoelectronics; nanomaterials; heteroepitaxy; silicon

Special Issue Information

Dear Colleagues,

Nanostructured materials have attracted considerable interest due to their novel physical properties and diversity for potential electronic and optoelectronic device applications. Two main methods were mostly developed to form well-defined and controlled nanostructures, namely, the top–down approach, which uses lithography and etching technologies, and the bottom–up approach or self-assembly, which uses chemical or physical forces operating at the nanoscale to assemble basic units into larger structures. In the past twenty years, a combination of these two methods has developed to design nanostructured materials with desired electronic and optical properties. At the same time, as the material sizes decrease, the surface plays a major role in their physical properties, and specific attention should be paid to take into account these effects and/or to passivate the surface. Currently, nanostructured materials are the basic building blocks of almost all devices used in the microelectronics and optoelectronics fields. 

Dr. Thierry Baron
Guest Editor

Manuscript Submission Information

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Keywords

  • nanomaterials
  • nanofabrication
  • nanoscale
  • self-assembling
  • functionalization
  • physical properties
  • microelectronics
  • optoelectronics

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Published Papers (3 papers)

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Research

14 pages, 5432 KiB  
Article
Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region
by Yan Liu, Tiesheng Wu, Yiping Wang, Zhihui Liu, Weiping Cao, Dan Yang, Zuning Yang, Rui Liu, Xu Zhong and Junyi Wang
Materials 2022, 15(18), 6239; https://doi.org/10.3390/ma15186239 - 8 Sep 2022
Cited by 1 | Viewed by 2072
Abstract
Beam splitters are vital components in several optical systems. It is highly desirable, and compact beam splitters with ultra-broadband performances, high efficiencies, and large split angles are still being sought. In this paper, we demonstrate and numerically investigate an ultra-broadband and highly efficient [...] Read more.
Beam splitters are vital components in several optical systems. It is highly desirable, and compact beam splitters with ultra-broadband performances, high efficiencies, and large split angles are still being sought. In this paper, we demonstrate and numerically investigate an ultra-broadband and highly efficient optical beam splitter based on a quasi-continuous metasurface. The proposed design is constructed of quasi-continuous triangle-shaped gallium phosphide nanoantennas on a silica substrate. The simple structure can achieve a conversion efficiency and an anomalous transmission intensity above 90% and 0.8 covering the wavelength range of 1537–1826 nm, respectively. The maximum beam split angle in the operating bandwidth reaches 131.84° at the wavelength of 1826 nm. Particularly, the operating bandwidth is still as high as 125 nm with the anomalous transmission intensity above 0.92 and the conversion efficiency exceeding 99%. Moreover, the results show that the performance of the metasurface-based optical beam splitter can be further enhanced by optimizing structural parameters. We also demonstrate the adjustability of the beam splitter by adding refractive index (RI) materials on the surface of the device. The results show that the incident plane wave can be divided into three beams with intensity adjustability. The presented metasurface is very promising in the fields of multiplexers, interferometers, and optical communications, owing to its advantages of ultra-broadband, highly efficient, and large split angle simultaneously. Full article
(This article belongs to the Special Issue Advances in Electronic and Optical Properties of Nanostructured Materials)
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14 pages, 5831 KiB  
Article
Novel Composite Nitride Nanoceramics from Reaction-Mixed Nanocrystalline Powders in the System Aluminum Nitride AlN/Gallium Nitride GaN/Titanium Nitride TiN (Al:Ga:Ti = 1:1:1)
by Mariusz Drygas, Katarzyna Lejda, Jerzy F. Janik, Svitlana Stelmakh and Bogdan Palosz
Materials 2022, 15(6), 2200; https://doi.org/10.3390/ma15062200 - 16 Mar 2022
Cited by 5 | Viewed by 2330
Abstract
A study is presented on the synthesis of reaction-mixed nitride nanopowders in the reference system of aluminium nitride AlN, gallium nitride GaN, and titanium nitride TiN (Al:Ga:Ti = 1:1:1) followed by their high-pressure and high-temperature sintering towards novel multi-nitride composite nanoceramics. The synthesis [...] Read more.
A study is presented on the synthesis of reaction-mixed nitride nanopowders in the reference system of aluminium nitride AlN, gallium nitride GaN, and titanium nitride TiN (Al:Ga:Ti = 1:1:1) followed by their high-pressure and high-temperature sintering towards novel multi-nitride composite nanoceramics. The synthesis starts with a 4 h reflux in hexane of the mixture of the respective metal dimethylamides, which is followed by hexane evacuation, and reactions of the residue in liquid ammonia at −33 °C to afford a mixed metal amide/imide precursor. Plausible equilibration towards a bimetallic Al/Ga-dimethylamide compound upon mixing of the solutions of the individual metal-dimethylamide precursors containing dimeric {Al[N(CH3)2]3}2 and dimeric {Ga[N(CH3)2]3}2 is confirmed by 1H- and 13C{H}-NMR spectroscopy in C6D6 solution. The precursor is pyrolyzed under ammonia at 800 and 950 °C yielding, respectively, two different reaction-mixed composite nitride nanopowders. The latter are subjected to no-additive high-pressure and high-temperature sintering under conditions either conservative for the initial powder nanocrystallinity (650 °C, 7.7 GPa) or promoting crystal growth/recrystallization and, possibly, solid solution formation via reactions of AlN and GaN towards Al0.5Ga0.5N (1000 and 1100 °C, 7.7 GPa). The sintered composite pellets show moderately high mechanical hardness as determined by the Vicker’s method. The starting nanopowders and resulting nanoceramics are characterized by powder XRD, Raman spectroscopy, and SEM/EDX. It is demonstrated that, in addition to the multi-nitride composite nanoceramics of hexagonal AlN/hexagonal GaN/cubic TiN, under specific conditions the novel composite nanoceramics made of hexagonal Al0.5Ga0.5N and cubic TiN can be prepared. Full article
(This article belongs to the Special Issue Advances in Electronic and Optical Properties of Nanostructured Materials)
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12 pages, 4502 KiB  
Article
Characterization of Silver Nanowire Layers in the Terahertz Frequency Range
by Aleksandra Przewłoka, Serguei Smirnov, Irina Nefedova, Aleksandra Krajewska, Igor S. Nefedov, Petr S. Demchenko, Dmitry V. Zykov, Valentin S. Chebotarev, Dmytro B. But, Kamil Stelmaszczyk, Maksym Dub, Dariusz Zasada, Alvydas Lisauskas, Joachim Oberhammer, Mikhail K. Khodzitsky, Wojciech Knap and Dmitri Lioubtchenko
Materials 2021, 14(23), 7399; https://doi.org/10.3390/ma14237399 - 2 Dec 2021
Cited by 2 | Viewed by 3680
Abstract
Thin layers of silver nanowires are commonly studied for transparent electronics. However, reports of their terahertz (THz) properties are scarce. Here, we present the electrical and optical properties of thin silver nanowire layers with increasing densities at THz frequencies. We demonstrate that the [...] Read more.
Thin layers of silver nanowires are commonly studied for transparent electronics. However, reports of their terahertz (THz) properties are scarce. Here, we present the electrical and optical properties of thin silver nanowire layers with increasing densities at THz frequencies. We demonstrate that the absorbance, transmittance and reflectance of the metal nanowire layers in the frequency range of 0.2 THz to 1.3 THz is non-monotonic and depends on the nanowire dimensions and filling factor. We also present and validate a theoretical approach describing well the experimental results and allowing the fitting of the THz response of the nanowire layers by a Drude–Smith model of conductivity. Our results pave the way toward the application of silver nanowires as a prospective material for transparent and conductive coatings, and printable antennas operating in the terahertz range—significant for future wireless communication devices. Full article
(This article belongs to the Special Issue Advances in Electronic and Optical Properties of Nanostructured Materials)
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