Special Issue "Next Generation Mechanical Metastructures"

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

Deadline for manuscript submissions: closed (23 May 2020).

Special Issue Editor

Dr. Ioannis E. Psarobas

Guest Editor
1. Section of Solid State Physics, National & Kapodistrian University of Athens, Greece
2. Vessel Performance Monitoring, Starbulk S.A., Greece – USA
Interests: theoretical and computational condensed matter physics; multiple scattering of classical waves in inhomogeneous media; phononic crystals; nanophotonics and nanophononics; phoxonic structures and cavities; photonic and phononic metamaterials; optomechanics; vibration harvesting; phononic isolators and microparticle photophysics

Special Issue Information

Dear Colleagues,

The crystals occurring in nature display the possible types of symmetry enclosed in an abundance of different forms as a result of constitution and environment. The dynamics of the crystalline lattice is also responsible for the crystal’s physical behavior, initiating a connection of utmost importance between quantum mechanics and symmetry. Symmetry plays a great role in ordering the atomic and molecular spectra, for the understanding of which the principles of quantum mechanics provide the key. An exact classical analogue of a natural crystal is a three-dimensional (3D) phononic crystal. Mechanics and symmetry have played an important role in generating structures identified as mechanical metamaterials, the unique properties of which have extended the meaning of mechanical behavior and response to a new level.

The study of classical spectral-gap materials (photonic and phononic crystals) has produced over the last 3 decades the backbone for developing new exciting structures, known as metamaterials, exhibiting exotic properties in relation to regular materials, but most importantly, from a scientific point of a view, they serve as a classical realization of well-known condensed matter physics phenomena, such as Anderson localization, heat management, Dirac point topology, quasicrystals, cavity optomechanics, and many more.

With mechanics (sound and vibration) as the starting point, we explore, in somewhat unchartered regions, the possibilities of developing next-generation metastructures as a fusion of Physics, Engineering, and Applied Mathematics in creating methods, applications, sensors, and metamaterials of a new breed. For that new breed, one has to keep in mind two important aspects: smart and multifunctional.

Submissions of new and original ideas on the subject will hold absolute priority in this pioneering endeavor.

Dr. Ioannis E. Psarobas
Guest Editor

Manuscript Submission Information

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  • phononic crystals
  • phoxonic crystals
  • optomechanics
  • sound and vibration
  • metamaterials
  • active metamaterials
  • topological acoustics
  • heat management
  • brillouin scattering
  • energy storage and harvesting

Published Papers (1 paper)

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Open AccessArticle
Directional Elastic Pseudospin and Nonseparability of Directional and Spatial Degrees of Freedom in Parallel Arrays of Coupled Waveguides
Appl. Sci. 2020, 10(9), 3202; https://doi.org/10.3390/app10093202 - 04 May 2020
We experimentally and numerically investigated elastic waves in parallel arrays of elastically coupled one-dimensional acoustic waveguides composed of aluminum rods coupled along their length with epoxy. The elastic waves in each waveguide take the form of superpositions of states in the space of [...] Read more.
We experimentally and numerically investigated elastic waves in parallel arrays of elastically coupled one-dimensional acoustic waveguides composed of aluminum rods coupled along their length with epoxy. The elastic waves in each waveguide take the form of superpositions of states in the space of direction of propagation. The direction of propagation degrees of freedom is analogous to the polarization of a quantum spin; hence, these elastic waves behave as pseudospins. The amplitude in the different rods of a coupled array of waveguides (i.e., the spatial mode of the waveguide array) refer to the spatial degrees of freedom. The elastic waves in a parallel array of coupled waveguides are subsequently represented as tensor products of the elastic pseudospin and spatial degrees of freedom. We demonstrate the existence of elastic waves that are nonseparable linear combinations of tensor products states of pseudospin/ spatial degrees of freedom. These elastic waves are analogous to the so-called Bell states of quantum mechanics. The amplitude coefficients of the nonseparable linear combination of states are complex due to the Lorentzian character of the elastic resonances associated with these waves. By tuning through the amplitudes, we are able to navigate both experimentally and numerically a portion of the Bell state Hilbert space. Full article
(This article belongs to the Special Issue Next Generation Mechanical Metastructures)
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