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Applied Sciences
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The Newest Research in Novel Materials
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The Newest Research in Novel Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (25 February 2022) | Viewed by 7901

Special Issue Editor

Dr. Tatjana Gric

E-Mail Website
Guest Editor
Department of Electronic Systems, VILNIUS TECH, 10223 Vilnius, Lithuania
Interests: nanomaterials; optoelectronics; photonics; nonlinear optics; nanophotonics; semiconductor; plasmonics; metamaterials; waves; photonic crystals; waveguides; nano-optics; surface plasmons
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue on The Newest Research in Novel Materials is devoted to discussing the recent developments in the fields of artificial materials and their applications ranging from compositions, structures such as orientation, arrangement, geometry, size, shape, and smart properties including manipulation of electromagnetic waves by blocking, absorbing, enhancing, or bending waves. Over the past 20 years, techniques for producing nanostructures have matured, resulting in a wide range of ground-breaking solutions that can control light and heat on very small scales. Some of the areas of advancement that have contributed to these techniques are photonic crystals, nanolithography, plasmonic phenomena, and nanoparticle manipulation. From these advances, a new branch of novel material science has emerged—metamaterials. Metamaterials have, in the last few decades, inspired scientists and engineers to think about waves beyond traditional constraints imposed by materials in which they propagate, conceiving new functionalities, such as subwavelength imaging, invisibility cloaking, and broadband ultraslow light. While mainly for ease of fabrication, many of the metamaterials concepts have initially been demonstrated at longer wavelengths and for microwaves, metamaterials have subsequently moved to photonic frequencies and the nanoscale. At the same time, metamaterials are recently embedding new quantum materials such as graphene, dielectric nanostructures and, as metasurfaces, surface geometries and surface waves, while also embracing new functionalities such as nonlinearity, quantum gain, and strong light–matter coupling. The Special Issue will provide a unique topical opportunity for engineers, students, researchers, professionals from academia and industries to present their research results, breakthrough innovations, discoveries, path-breaking ideas, experiences, and products display at an international platform.

Prof. Dr. Tatjana Gric
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. Applied Sciences 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 2400 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

  • metamaterial
  • semiconductor
  • metal
  • graphene
  • disorder
  • thermoelectric
  • mechanical
  • hyperbolic

Published Papers (4 papers)

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Research

13 pages, 2833 KiB  
Article
Discretization Approach for the Homogenization of Three-Dimensional Solid-Solid Phononic Crystals in the Quasi-Static Limit: Density and Elastic Moduli
by J. Flores Méndez, A. C. Pinón Reyes, Aurelio H. Heredia Jiménez, Roberto C. Ambrosio Lázaro, A. Morales-Sánchez, M. Moreno Moreno, J. A. Luna-López, F. Severiano Carrillo and M. A. Meraz Melo
Appl. Sci. 2022, 12(6), 2987; https://0-doi-org.brum.beds.ac.uk/10.3390/app12062987 - 15 Mar 2022
Cited by 3 | Viewed by 1517
Abstract
With the application of a homogenization theory, based on the Fourier formalism (which provides efficient and exact formulas by which to determine all the components of the effective stiffness and mass density tensors, valid in the regime of large wavelengths), a new approach [...] Read more.
With the application of a homogenization theory, based on the Fourier formalism (which provides efficient and exact formulas by which to determine all the components of the effective stiffness and mass density tensors, valid in the regime of large wavelengths), a new approach to calculate the effective quasi-static response in three-dimensional solid-solid phononic crystals is reported. The formulas derived in this work for calculating the effective elastic parameters show a dependence, in terms of summations over the vectors, of the reciprocal lattice by the discretization of the volume of the inclusion in small parts (e.g., small cubes), to obtain a system of equations from which we define the effective response. In particular, we present the numerical results calculated for several cubic lattices with solid constituents and different shapes of inclusions in the unit cell versus the filling fraction, as well as for fixed values of it. By this means, we analyzed the effect of the type of Bravais lattice of the materials, and the geometry of the inclusions that constitute the three-dimensional phononic array, on the resulting effective anisotropy. Finally, our theory confirms other well-known results with previous homogenization theories as a particular case study. In this regard, the examples and results shown here can be useful for the design of metamaterials with predetermined elastic properties. Full article
(This article belongs to the Special Issue The Newest Research in Novel Materials)
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17 pages, 2929 KiB  
Article
Biomimicry-Gradient-Based Algorithm as Applied to Photonic Devices Design: Inverse Design of Flat Plasmonic Metalenses
by Kofi Edee
Appl. Sci. 2021, 11(12), 5436; https://0-doi-org.brum.beds.ac.uk/10.3390/app11125436 - 11 Jun 2021
Cited by 2 | Viewed by 1850
Abstract
The classical adjoint-based topology optimization (TO) method, based on the use of a random continuous dielectric function as design variable distribution is known to be one of the timely efficient and fast optimization methods enable a very high performance functional optical devices. It [...] Read more.
The classical adjoint-based topology optimization (TO) method, based on the use of a random continuous dielectric function as design variable distribution is known to be one of the timely efficient and fast optimization methods enable a very high performance functional optical devices. It relies on the computation of the gradient of a figure of merit (FOM) with respect to the design parameters. The gradient of the figure of merit (FOM) may then be used to update the design vector element in several senarios. One of the most common use scenario consists of updating simultaneously all the design parameter vector elements. In a linear problem case involving a simply convex FOM-function shape, using the gradient information, it is a relatively easy to reach an optimal solution. In the case of constrained and non linear problems stated in an infinite and indeterminate design space, the conventional TO, a local optimizer, may require multiple restarts, with multiple initial points and multiple runs. The algorithm strongly depends on the initial conditions. In this paper, we report a global-like optimizer inspired by a wolf pack hunting, enabling efficient design of metasurfaces through their geometrical parameters. We apply the method to design a non periodic metasurface consisting of plasmonic metalenses, enabling a high energy flow focusing on a well-defined 2D focus spot. Numerical results show that the proposed inverse design method has a low sensitivity to initial conditions. In our design method of metalens, we optimize the full micro device at once, and demonstrate that the proposed method may provide both symmetric and more creative unexpected asymmetric on-axis metalenses even though under a normal illumination. Full article
(This article belongs to the Special Issue The Newest Research in Novel Materials)
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15 pages, 3282 KiB  
Article
The Study of the Surface Plasmon Polaritons at the Interface Separating Nanocomposite and Hypercrystal
by Thanos Ioannidis, Tatjana Gric and Edik Rafailov
Appl. Sci. 2021, 11(11), 5255; https://0-doi-org.brum.beds.ac.uk/10.3390/app11115255 - 05 Jun 2021
Cited by 3 | Viewed by 1878
Abstract
Surface plasmon polaritons (SPPs) propagating at the interfaces of composite media possess a number of fascinating properties not emerging in case of conventional SPPs, i.e., at metal-dielectric boundaries. We propose here a helpful algorithm giving rise for investigation of basic features of complex [...] Read more.
Surface plasmon polaritons (SPPs) propagating at the interfaces of composite media possess a number of fascinating properties not emerging in case of conventional SPPs, i.e., at metal-dielectric boundaries. We propose here a helpful algorithm giving rise for investigation of basic features of complex conductivity dependent SPPs at the interface separating nanocomposite and hypercrystal. The main goal of the work is to investigate dispersion of the SPPs propagating at the boundary separating two different media. Aiming to achieve the aforementioned goal that the effective Maxwell Garnett model is used. It is demonstrated that the SPPs dispersive properties are dramatically affected by the material conductivity. Correspondingly, the filling ratio of the nanoparticles in the composite and their dielectric properties also allow one to engineer characteristics of the SPPs. Having a deep insight into the conductivity dependent functions, we concluded, on their behavior for the case of hyperbolic regime and Dyakonov surface waves case. Our model gives rise for studying features of surface waves in the complex conductivity plane and provides more options to tune the fundamental features of SPPs at the boundaries correlated with composite media. Full article
(This article belongs to the Special Issue The Newest Research in Novel Materials)
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7 pages, 2241 KiB  
Article
Absorption Enhancement in Hyperbolic Metamaterials by Means of Magnetic Plasma
by Tatjana Gric and Edik Rafailov
Appl. Sci. 2021, 11(11), 4720; https://0-doi-org.brum.beds.ac.uk/10.3390/app11114720 - 21 May 2021
Cited by 1 | Viewed by 1542
Abstract
The main features of surface plasmon polaritons (SPPs) that can propagate in a metamaterial–magnetic plasma structure are studied from theoretical perspectives. Both the conventional and imaginary parts of the dispersion relation of SPPs are demonstrated considering transverse magnetic (TM) polarization. We examine and [...] Read more.
The main features of surface plasmon polaritons (SPPs) that can propagate in a metamaterial–magnetic plasma structure are studied from theoretical perspectives. Both the conventional and imaginary parts of the dispersion relation of SPPs are demonstrated considering transverse magnetic (TM) polarization. We examine and discuss the influence of the external magnetic field. The results demonstrate that this factor dramatically alters the nature of SPPs. It is concluded that the positions and propagation lengths of SPPs can be engineered. Moreover, we present an approach allowing for an absorption enhancement that is a pivotal factor in antenna design. A unified insight into the practical methods aiming to attain hyperbolic dispersion by means of nanostructured and nanowire metamaterials is demonstrated. Full article
(This article belongs to the Special Issue The Newest Research in Novel Materials)
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