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Applied Sciences
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Recent Advances in Plasmonics and Nanophotonics
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Recent Advances in Plasmonics and Nanophotonics

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

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 15116

Special Issue Editors

Prof. Dr. Domenico de Ceglia

E-Mail Website1 Website2
Guest Editor
Department of Information Engineering, University of Padova, 35121 Padova, Italy
Interests: plasmonics; nonlinear optics; optical antennas; metamaterials; photonic crystals; optics and photonics; nanophotonics; biophotonics; electromagnetics
Dr. Maria Antonietta Vincenti

E-Mail Website
Guest Editor
Department of Information Engineering, University of Brescia, Brescia, Italy
Interests: nonlinear optics; plasmonics; electromagnetics

Special Issue Information

Dear Colleagues,

The last two decades have witnessed a steady growth of plasmonic and nanophotonics, two sub-fields of optics that lie at the crossroads of many disciplines: Physical optics, material science, engineering, computational electromagnetics, quantum mechanics, quantum electrodynamics, biology and chemistry. Touching all aspects of light–matter interactions on the nanoscale, plasmonics and nanophotonics have stimulated the advancement of nanofabrication technologies and challenged the limitations of classical and established electromagnetic theories and modeling tools. New interesting phenomena have been observed in engineered nanostructures, and new playgrounds created for the development of high-efficiency and multifunctional photonic devices, based on photonic crystals, metamaterials, metasurfaces and optical antennas. The realm of applications of plasmonics and nanophotonics is wide and constantly expanding, ranging from optical communications to information and signal processing, nanomedicine, sensing, energy harvesting, heat management, and nanoscale light sources.

This Special Issue aims to provide an overview of the latest advances in fundamentals and applications of plasmonics and nanophotonics. All aspects of optics at the nanoscale are welcome, including, but not limited to, the following topics:

  • Physical optics of nanostructures
  • Nanoplasmonics
  • Nonlinear optics of nanostructures
  • Quantum, nonlinear and nonlocal effects in plasmonic nanostructures
  • All-dielectric metasurfaces
  • Nanoantennas and Mie resonators
  • Optothermal properties of photonic nanostructures
  • Metamaterials, metasurfaces, photonic crystals, and nanostructured diffraction gratings
  • Nanowaveguides
  • Theory and modeling of photonic nanostructures
  • Photonics of 2D materials
  • Nanofabrication techniques

Prof. Dr. Domenico de Ceglia
Dr. Maria Antonietta Vincenti
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

  • plasmonics
  • nanophotonics
  • nanostructures
  • optical devices
  • nanoantennas
  • metasurfaces
  • nanoresonators
  • tunable and nonlinear nanophotonic devices
  • electromagnetic modeling

Published Papers (5 papers)

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Research

12 pages, 4166 KiB  
Article
Extension of an FFT-Based Beam Propagation Method to Plasmonic and Dielectric Waveguide Discontinuities and Junctions
by Adel Shaaban, Yi-Chun Du and Lotfy Rabeh Gomaa
Appl. Sci. 2019, 9(20), 4362; https://doi.org/10.3390/app9204362 - 16 Oct 2019
Cited by 5 | Viewed by 2774
Abstract
We adapted a fast Fourier transform-based Beam Propagation Method (FFT-BPM) to investigate waveguide discontinuities in plasmonic waveguides. The adaptation of the FFT-BPM to treat transverse magnetic (TM) fields requires the circumvention of two major difficulties: the mixed derivatives of the magnetic field and [...] Read more.
We adapted a fast Fourier transform-based Beam Propagation Method (FFT-BPM) to investigate waveguide discontinuities in plasmonic waveguides. The adaptation of the FFT-BPM to treat transverse magnetic (TM) fields requires the circumvention of two major difficulties: the mixed derivatives of the magnetic field and waveguide refractive index profile in the TM wave equation and the step-like index change at the transverse metal-dielectric boundary of the plasmonic guide and the transverse boundaries of the dielectric waveguide as well. An equivalent-index method is adopted to transform TM fields to transverse electric (TE) ones, thus enabling the benefit of the full power and simplicity of the FFT-BPM. Moreover, an appropriate smoothing function is used to approximate the step-like refractive index profile in the transverse direction. At the junction plane, we used an accurate combined spatial-spectral reflection operator to calculate the reflected field. To validate our proposed scheme, we investigated the modal propagation in a silicon waveguide terminated by air (like a laser facet in two cases: with and without a coating layer). Then we considered a subwavelength plasmonic waveguide (metal-insulator-metal MIM) butt-coupled with a dielectric waveguide, where the power transmission efficiency has been calculated and compared with other numerical methods. The comparison reveals good agreement. Full article
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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15 pages, 5595 KiB  
Article
Second-Harmonic Generation in Mie-Resonant GaAs Nanowires
by Domenico de Ceglia, Luca Carletti, Maria Antonietta Vincenti, Costantino De Angelis and Michael Scalora
Appl. Sci. 2019, 9(16), 3381; https://doi.org/10.3390/app9163381 - 16 Aug 2019
Cited by 17 | Viewed by 3576
Abstract
We investigate the enhancement of second-harmonic generation in cylindrical GaAs nanowires. Although these nanostructures confine light in two dimensions, power conversion efficiencies on the order of 10 − 5 with a pump peak intensity of ~ 1   GW / cm 2 are [...] Read more.
We investigate the enhancement of second-harmonic generation in cylindrical GaAs nanowires. Although these nanostructures confine light in two dimensions, power conversion efficiencies on the order of 10 − 5 with a pump peak intensity of ~ 1   GW / cm 2 are possible if the pump and the second-harmonic fields are coupled to the Mie-type resonances of the nanowire. We identify a large range of nanowire radii in which a double-resonance condition, i.e., both the pump and the second-harmonic fields excite normal modes of the nanowire, induces a high-quality-factor peak of conversion efficiency. We show that second-harmonic light can be scattered with large efficiency even if the second-harmonic photon energy is larger than 1.42 eV, i.e., the electronic bandgap of GaAs, above which the material is considered opaque. Finally, we evaluate the efficiency of one-photon absorption of second-harmonic light and find that resonant GaAs nanowires absorb second-harmonic light in the near-field region almost at the same rate at which they radiate second-harmonic light in the far-field region. Full article
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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11 pages, 2677 KiB  
Article
Enhancing Absorption Bandwidth through Vertically Oriented Metamaterials
by Aaron J. Pung, Michael D. Goldflam, D. Bruce Burckel, Igal Brener, Michael B. Sinclair and Salvatore Campione
Appl. Sci. 2019, 9(11), 2223; https://doi.org/10.3390/app9112223 - 30 May 2019
Cited by 8 | Viewed by 2581
Abstract
Metamaterials research has developed perfect absorbers from microwave to optical frequencies, mainly featuring planar metamaterials, also referred to as metasurfaces. In this study, we investigated vertically oriented metamaterials, which make use of the entire three-dimensional space, as a new avenue to widen the [...] Read more.
Metamaterials research has developed perfect absorbers from microwave to optical frequencies, mainly featuring planar metamaterials, also referred to as metasurfaces. In this study, we investigated vertically oriented metamaterials, which make use of the entire three-dimensional space, as a new avenue to widen the spectral absorption band in the infrared regime between 20 and 40 THz. Vertically oriented metamaterials, such as those simulated in this work, can be experimentally realized through membrane projection lithography, which allows a single unit cell to be decorated with multiple resonators by exploiting the vertical dimension. In particular, we analyzed the cases of a unit cell containing a single vertical split-ring resonator (VSRR), a single planar split-ring resonator (PSRR), and both a VSRR and PSRR to explore intra-cell coupling between resonators. We show that the additional degrees of freedom enabled by placing multiple resonators in a unit cell lead to novel ways of achieving omnidirectional super absorption. Our results provide an innovative approach for controlling and designing engineered nanostructures. Full article
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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9 pages, 2613 KiB  
Article
Dual-Band Light Absorption Enhancement in Hyperbolic Rectangular Array
by Honglong Qi, Tian Sang, La Wang, Xin Yin, Jicheng Wang and Yueke Wang
Appl. Sci. 2019, 9(10), 2011; https://doi.org/10.3390/app9102011 - 16 May 2019
Cited by 11 | Viewed by 2308
Abstract
The effect of dual-band light absorption enhancement in a hyperbolic rectangular array (HRA) is presented. The enhanced light absorption of the HRA results from the propagating surface plasmon (PSP) resonance, and a dual-band absorption with low and flat sideband level can be realized. [...] Read more.
The effect of dual-band light absorption enhancement in a hyperbolic rectangular array (HRA) is presented. The enhanced light absorption of the HRA results from the propagating surface plasmon (PSP) resonance, and a dual-band absorption with low and flat sideband level can be realized. The impedance theory is used to evaluate the absorption properties of the HRA, and shows that the input impedances of the HRA varied abruptly around the absorption bands to meet the impedance matching. The absorption spectra of the HRA can be estimated using the effective medium theory (EMT), and its accuracy can be improved as the number of film stacks is increased. The dual-band absorptions of the HRA are very robust to the variations of the width and the number of film stack. Potential application in refractive index sensing can be achieved by utilizing the two absorption bands. Full article
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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Graphical abstract

13 pages, 2344 KiB  
Article
Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation
by Michele De Regis, Luigi Consolino, Saverio Bartalini and Paolo De Natale
Appl. Sci. 2018, 8(12), 2374; https://doi.org/10.3390/app8122374 - 24 Nov 2018
Cited by 33 | Viewed by 3435
Abstract
The 1–10 terahertz (THz) spectral window is emerging as a key region for plenty of applications, requiring not yet available continuous-wave room-temperature THz spectrometers with high spectral purity and ultra-broad tunability. In this regard, the spectral features of stabilized telecom sources can actually [...] Read more.
The 1–10 terahertz (THz) spectral window is emerging as a key region for plenty of applications, requiring not yet available continuous-wave room-temperature THz spectrometers with high spectral purity and ultra-broad tunability. In this regard, the spectral features of stabilized telecom sources can actually be transferred to the THz range by difference frequency generation, considering that the width of the accessible THz spectrum generally scales with the area involved in the nonlinear interaction. For this reason, in this paper we extensively discuss the role of Lithium Niobate (LN) channel-waveguides in the experimental accomplishment of a room-temperature continuous wave (CW) spectrometer, with μW-range power levels and a spectral coverage of up to 7.5 THz. To this purpose, and looking for further improvements, a thought characterization of specially-designed LN waveguides is presented, whilst discussing its nonlinear efficiency and its unprecedented capability to handle high optical power (107 W/cm2), on the basis of a three-wave-mixing theoretical model. Full article
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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