Special Issue "Advances in Nanophononics"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 30 September 2020.

Special Issue Editor

Dr. Francesc Alzina Sureda
Website
Guest Editor
Catalan Institute of Nanoscience and Nanotechnology | ICN2, Phononic and Photonic Nanostructures, Campus de la UAB, Bellaterra 08193, Spain
Interests: Control of phonon propagation in nanostructures; phonon–photon interaction

Special Issue Information

Dear Colleagues,

This Special Issue is aimed to present original research papers or comprehensive reviews covering recent progress and new developments in the area of nanophononics. The topics span a wide range of research subjects, either from the experimental or the theoretical points of view, including experimental methods.

Phonons are quantized mechanical vibrations and, as electrons and photons, could be employed as energy and information carriers. The reality is that the technological accomplishments of electronics and photonics have sometimes brought the field of phononics to emulate the former rather than exploiting the distinctive nature of phonons. The current state-of-the-art top-down fabrication sets a lowermost limit to feature size of about 10 nm, influencing the propagation of phonons in a frequency range where phononics can potentially become technologically relevant. Therefore, bringing phonons to the nanoscale has already generated an enormous increase of the activity in the field and, specifically, in the area known as nanophononics. Artificial structuring in the form of plates, layers, phononic crystals, and metamaterials leads to spatial dispersion as a result of symmetry constrictions and morphology of the structure. While the former rule the existing mode symmetries and the occurrence of interactions between phonon states, the latter controls the strength of the interaction. Therefore, the response of the medium depends on the ratio of length scales between the wave and the geometrical structures of the medium. This has stimulated the prospect of the rational design of phononic structures to obtain a desired wave’s behaviour or unconventional wave topologies. In the case that the artificial inhomogeneity is not static but spatial and time-dependent, it may cause time-reversal symmetry breaking, and non-reciprocal wave propagation may occur. 

Finally, elastic waves provide an adaptable approach for supporting a coherent coupling between different state variables, which promises a myriad of novel signal-processing functionalities in hybrid systems.

Dr. Francesc Alzina Sureda 
Guest Editor

Manuscript Submission Information

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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. Nanomaterials 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 2000 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

  • Elastic Metamaterials and Metasurfaces
  • Inverse and rational design
  • Active/Adaptive phononic structures
  • Unconventional elastic waves
  • Non-reciprocal elastic wave propagation
  • Generation and detection of coherent phonons
  • Interaction of phonons with other particles and quasiparticles

Published Papers (2 papers)

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Research

Open AccessArticle
Filtering Characteristics of Phonon Polaritons Waves Based on Dielectric-h-BN-Dielectric Structure in Mid-Infrared Band
Nanomaterials 2020, 10(5), 878; https://doi.org/10.3390/nano10050878 - 01 May 2020
Abstract
Hyperbolic materials can be used to excite hyperbolic phonon polaritons in specific frequency bands, which causes abrupt interfaces with fluctuations of permittivity and different transmission characteristics at different incident wavelengths. Using the quasi-static approximation, the filtering characteristics of hexagonal Boron nitride (h-BN) and [...] Read more.
Hyperbolic materials can be used to excite hyperbolic phonon polaritons in specific frequency bands, which causes abrupt interfaces with fluctuations of permittivity and different transmission characteristics at different incident wavelengths. Using the quasi-static approximation, the filtering characteristics of hexagonal Boron nitride (h-BN) and the transmission characteristics of phonon polaritons waves on a dielectric-h-BN-dielectric structure were studied in the paper. The results show that a smaller relative permittivity of the materials above and below h-BN and a thicker h-BN (ε1 = 1 (air), ε2 = 3.9 (SiO2), d = 100 nm) will lead to better filtering characteristics for different wavenumbers’ incident waves (propagation length from 0.0028 μm to 1.9756 μm). Simulation results in COMSOL validated the previous theoretical calculations. Moreover, the transmissivity and 3dB bandwidth of the type-II band were calculated with different structure widths. The maximum transmissivity of ~99% appears at a width of 100 nm, and the minimum 3dB bandwidth reaches 86.35 cm−1 at a structure width of 1300 nm. When the structure width meets or exceeds 1700 nm, the 3dB bandwidth is equal to 0, and its structure length is the limit for the filter application. These characteristics reveal the excellent filtering characteristics of the dielectric-h-BN-dielectric structure, and reveal the great potential of using the dielectric-h-BN-dielectric structure to design optical filter devices with excellent performance in mid-infrared bands. Full article
(This article belongs to the Special Issue Advances in Nanophononics)
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Open AccessArticle
Coherent Thermal Conduction in Silicon Nanowires with Periodic Wings
Nanomaterials 2019, 9(2), 142; https://doi.org/10.3390/nano9020142 - 22 Jan 2019
Cited by 1
Abstract
Artificial periodic nanostructures, known as phononic crystals, promise to control the thermal properties of nanostructures in the coherent regime, which can be achieved in semiconductors at low temperatures. Here, we study coherent thermal conduction in silicon nanowires with added periodic wings at sub-Kelvin [...] Read more.
Artificial periodic nanostructures, known as phononic crystals, promise to control the thermal properties of nanostructures in the coherent regime, which can be achieved in semiconductors at low temperatures. Here, we study coherent thermal conduction in silicon nanowires with added periodic wings at sub-Kelvin temperature. Our simulations show that the added periodic wings flatten the phonon dispersion and thus reduce the thermal conductance. We investigate the dependence of this reduction on the size of the wings and conclude that the reduction is mainly caused by the periodicity of the wings, rather than by local resonances in them. These findings help to better understand the mechanisms controlling coherent heat conduction in periodic resonant nanostructures. Full article
(This article belongs to the Special Issue Advances in Nanophononics)
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