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Applied Sciences
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Nano-Antennas
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Nano-Antennas

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

Deadline for manuscript submissions: closed (31 May 2018) | Viewed by 35994

Special Issue Editors

Prof. Dr. Gregory Slepyan

E-Mail Website
Guest Editor
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
Interests: antennas; microwave theory and techniques; carbon nanotubes and graphene; semiconductor quantum dots; quantum optics; nonlinear oscillations and waves
Prof. Dr. Amir Boag

E-Mail Website
Guest Editor
School of Electrical Engineering, Tel Aviv University, Tel Aviv 69978, Israel
Interests: computational electromagnetics and acoustics; fast multilevel algorithms; antenna and nano-antenna design; imaging techniques

Special Issue Information

Dear Colleagues,

The topic of nanoantennas covers a vast research area, partially overlapping with nano-electronics and nano-photonics, plasmonics, quantum optics, metamaterials, regimes of strong and ultra-strong coupling of light with condensed matter, electromagnetic compatibility on nano-scale, rectennas for solar cells, etc. Experimental and theoretical work on nanoantennas is an area of great significance both for fundamental studies and numerous applications. Highly directive transmitting and receiving nanoantennas have been implemented in terahertz, infrared, and optical frequency ranges based on plasmonic nanowires, carbon nanotubes, graphene, and semiconductor quantum dots. New artificially created optical structures have been made available (such as photonic crystals, metamaterials, molecular nano-junctions, etc.), which open ways to implement the physical mechanisms for antenna design—e.g., the Purcell-effect, superradiance, collective spontaneous emission, electron tunneling, and Rabi-oscillations. Closely related to nanoantennas are their non-linear counterparts, which admit electrical antenna scanning, light detection, and rectification inside the antenna. Completely new perspectives for the application of nanoantennas emerge in the areas of spectroscopy, quantum optics, communications and informatics, super-accurate measurements, nondestructive testing and electromagnetic compatibility of nanoelectronic devices.

The present Special Issue is devised as a collection of articles reporting both concise reviews of recently obtained results, and new findings produced in this broad research area. The topics are not limited strictly to traditional antenna problems, but are assumed to address related fields, such as photonic in general (including computer modeling in electrodynamics), plasmonics, and new real or potential applications.

Prof. Gregory Slepyan
Prof. Amir Boag
Guest Editors

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

  • antennas

  • carbon nanotubes

  • graphene

  • surface plasmon polaritons

  • rectennas

  • quantum optics

  • nanowires

  • electromagnetic compatibility

  • numerical methods

Published Papers (6 papers)

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Research

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14 pages, 2011 KiB  
Article
Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides
by Alexander Krasnok and Andrea Alù
Appl. Sci. 2018, 8(7), 1157; https://0-doi-org.brum.beds.ac.uk/10.3390/app8071157 - 17 Jul 2018
Cited by 29 | Viewed by 7717
Abstract
Monolayer (1L) transition-metal dichalcogenides (TMDCs) are attractive materials for several optoelectronic applications because of their strong excitonic resonances and valley-selective response. Valley excitons in 1L-TMDCs are formed at opposite points of the Brillouin zone boundary, giving rise to a valley degree of freedom [...] Read more.
Monolayer (1L) transition-metal dichalcogenides (TMDCs) are attractive materials for several optoelectronic applications because of their strong excitonic resonances and valley-selective response. Valley excitons in 1L-TMDCs are formed at opposite points of the Brillouin zone boundary, giving rise to a valley degree of freedom that can be treated as a pseudospin, and may be used as a platform for information transport and processing. However, short valley depolarization times and relatively short exciton lifetimes at room temperature prevent using valley pseudospins in on-chip integrated valley devices. Recently, it was demonstrated how coupling these materials to optical nanoantennas and metasurfaces can overcome this obstacle. Here, we review the state-of-the-art advances in valley-selective directional emission and exciton sorting in 1L-TMDC mediated by nanostructures and nanoantennas. We briefly discuss the optical properties of 1L-TMDCs paying special attention to their photoluminescence/absorption spectra, dynamics of valley depolarization, and the valley Hall effect. Then, we review recent works on nanostructures for valley-selective directional emission from 1L-TMDCs. Full article
(This article belongs to the Special Issue Nano-Antennas)
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13 pages, 1722 KiB  
Article
Quantum Antenna as an Open System: Strong Antenna Coupling with Photonic Reservoir
by Alexei Komarov and Gregory Slepyan
Appl. Sci. 2018, 8(6), 951; https://0-doi-org.brum.beds.ac.uk/10.3390/app8060951 - 08 Jun 2018
Cited by 9 | Viewed by 4386
Abstract
We propose a general concept of quantum antenna in the strong coupling regime. It is based on the theory of open quantum systems. Antenna emission into space is considered an interaction with a thermal photonic reservoir. For antenna dynamics modeling, we formulate master [...] Read more.
We propose a general concept of quantum antenna in the strong coupling regime. It is based on the theory of open quantum systems. Antenna emission into space is considered an interaction with a thermal photonic reservoir. For antenna dynamics modeling, we formulate master equations with a corresponding Lindblad super-operators for the radiation terms. It is shown that strong coupling dramatically changes the radiation pattern of antenna. The total power pattern splits to three partial components, each of which corresponds to a spectral line in Mollow triplet. We analyzed the dependence of splitting on the length of antenna, shift of the phase, and Rabi-frequency. The predicted effect opens a way for implementation of multi-beam electrically tunable antennas, potentially useful in different nano-devices. Full article
(This article belongs to the Special Issue Nano-Antennas)
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28 pages, 7178 KiB  
Article
Bloch Oscillations in the Chains of Artificial Atoms Dressed with Photons
by Ilay Levie and Gregory Slepyan
Appl. Sci. 2018, 8(6), 937; https://0-doi-org.brum.beds.ac.uk/10.3390/app8060937 - 06 Jun 2018
Cited by 3 | Viewed by 4655
Abstract
We present a model of one-dimensional chain of two-level artificial atoms driven with DC field and quantum light simultaneously in a strong coupling regime. The interaction of atoms with light leads to electron-photon entanglement (dressing of the atoms with light). The driving via [...] Read more.
We present a model of one-dimensional chain of two-level artificial atoms driven with DC field and quantum light simultaneously in a strong coupling regime. The interaction of atoms with light leads to electron-photon entanglement (dressing of the atoms with light). The driving via dc field leads to the Bloch oscillations (BO) in the chain of dressed atoms. We consider the mutual influence of dressing and BO and show that scenario of oscillations dramatically differs from predicted by the Jaynes-Cummings and Bloch-Zener models. We study the evolution of the population inversion, tunneling current, photon probability distribution, mean number of photons, and photon number variance, and show the influence of BO on the quantum-statistical characteristics of light. For example, the collapse-revivals picture and vacuum Rabi-oscillations are strongly modulated with Bloch frequency. As a result, quantum properties of light and degree of electron-photon entanglement become controllable via adiabatic dc field turning. On the other hand, the low-frequency tunneling current depends on the quantum light statistics (in particular, for coherent initial state it is modulated accordingly the collapse-revivals picture). The developed model is universal with respect to the physical origin of artificial atom and frequency range of atom-light interaction. The model is adapted to the 2D-heterostructures (THz frequencies), semiconductor quantum dots (optical range), and Josephson junctions (microwaves). The data for numerical simulations are taken from recently published experiments. The obtained results open a new way in quantum state engineering and nano-photonic spectroscopy. Full article
(This article belongs to the Special Issue Nano-Antennas)
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9 pages, 1364 KiB  
Article
Numerical Simulation of the Percolation Threshold in Non-Overlapping Ellipsoid Composites: Toward Bottom-Up Approach for Carbon Based Electromagnetic Components Realization
by Artyom Plyushch, Patrizia Lamberti, Giovanni Spinelli, Jan Macutkevič and Polina Kuzhir
Appl. Sci. 2018, 8(6), 882; https://0-doi-org.brum.beds.ac.uk/10.3390/app8060882 - 28 May 2018
Cited by 9 | Viewed by 3865
Abstract
A Monte Carlo (MC) model for the calculation of the percolation threshold in the composite filled with ellipsoids of revolution is developed to simulate the real experimental situation of percolative composites in which functional additives do not penetrate each other. The important advantage [...] Read more.
A Monte Carlo (MC) model for the calculation of the percolation threshold in the composite filled with ellipsoids of revolution is developed to simulate the real experimental situation of percolative composites in which functional additives do not penetrate each other. The important advantage is that the MC model can be easily applied to multi-components composites, e.g., containing graphene nanoplatelets, carbon black and carbon nanotubes, by means of utilising the ellipsoids of different aspect ratios with the filling fraction corresponding to concentrations of each type of inclusion. The developed model could be used in a pre-experimental step for producing effective close-to percolation and percolated nanocomposites for various electromagnetic applications to avoid time and resources consuming the “sort-out” experimental phase of composition optimization, and could be utilized as the first step of the bottom-up material approach to touch the macroscopic platform for antennas/circuit realization. Full article
(This article belongs to the Special Issue Nano-Antennas)
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3201 KiB  
Article
Gap-Dependent Localized High Energy Multiple Dipolar Modes in Passive Silver-Coated Silica Nanoparticle Antennas
by Atta Ur Rahman, Junping Geng, Sami Ur Rehman, Khizar Hayat, Xianling Liang and Ronghong Jin
Appl. Sci. 2017, 7(11), 1183; https://0-doi-org.brum.beds.ac.uk/10.3390/app7111183 - 17 Nov 2017
Cited by 3 | Viewed by 4090
Abstract
The gap-induced plasmonic response of metallic nanoparticles drastically changes the near and far-field properties of nanoparticle antenna. Similar to a pair of metallic nanostructures, the two nanoparticles, with a dielectric core and silver shell in close proximity, exhibit multiple high energy plasmonic resonances [...] Read more.
The gap-induced plasmonic response of metallic nanoparticles drastically changes the near and far-field properties of nanoparticle antenna. Similar to a pair of metallic nanostructures, the two nanoparticles, with a dielectric core and silver shell in close proximity, exhibit multiple high energy plasmonic resonances at the short wavelength end of their optical spectrum. In this article, we have overwhelmingly investigated the disparity in the electric field of a core–shell dimer antenna when the gap between nanoparticles within the dimer becomes sub-nanometer in length. We used an electromagnetic planewave to excite the core–shell nanoparticles within the dimer. Frequency domain Finite Element Method (FEM) was employed for the numerical optical analysis of a dimer comprised of two silver-coated silica (SCS) nanoparticles in close proximity, using Computer Simulation Technology (CST) Microwave Studio. A modified Drude model has been used to predict the optical properties of the system with incorporating the size effects. The SCS dimer was numerically analyzed in the visible frequency band, and anomalies in near-field plasmonic coupling were investigated in detail. The inter-surface gap g between nanoparticles within the dimer varied in a range from 0.1 to 402 nm. Full article
(This article belongs to the Special Issue Nano-Antennas)
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Review

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13 pages, 4382 KiB  
Review
Optically Transparent Nano-Patterned Antennas: A Review and Future Directions
by Seung Yoon Lee, Moogoong Choo, Sohyeon Jung and Wonbin Hong
Appl. Sci. 2018, 8(6), 901; https://0-doi-org.brum.beds.ac.uk/10.3390/app8060901 - 31 May 2018
Cited by 55 | Viewed by 10332
Abstract
Transparent antennas have been continuously developed for integration with solar cells, vehicular communications, and ultra-high-speed communications such as 5G in recent years. A transparent antenna takes advantage of spatial extensibility more so than all other antennas in terms of wide range of usable [...] Read more.
Transparent antennas have been continuously developed for integration with solar cells, vehicular communications, and ultra-high-speed communications such as 5G in recent years. A transparent antenna takes advantage of spatial extensibility more so than all other antennas in terms of wide range of usable area. In addition, the production price of transparent antennas is steadily decreasing due to the development of nano-process technology. This paper reviews published studies of transparent antennas classified by various materials in terms of optical transmittance and electrical, sheet resistance. The transparent electrodes for the transparent antenna are logically classified and the transparent antennas are described according to the characteristics of each electrode. Finally, the contributions transparent antennas can make toward next-generation 5G high-speed communication are discussed. Full article
(This article belongs to the Special Issue Nano-Antennas)
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