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Nanomaterials
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Plasmonic Nanoresonators
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Plasmonic Nanoresonators

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 9673

Special Issue Editor

Dr. Mária Csete

E-Mail Website
Guest Editor
Department of Optics and Quantum Electronics, University of Szeged, H-6720 Szeged, Hungary
Interests: plasmonic resonator configuration design and optimization; light–matter interaction phenomena; fluorescent light emission; non-classical light emission; infrared photodetection; biosensing; lithography
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Resonators in the classical sense are artificial structures that enhance signals at specific wavelengths via modes governed by geometrical parameters. Nanotechnology has opened the avenues to designing and fabricating nanoresonators, which can be excited by light despite their subwavelength size-scale. This is due to mode confinement in metallic structures, which is enabled by the excitation of plasmonic modes. Design and application of plasmonic nanoresonators is an inspiring, beautiful, and rapidly developing research area. All phenomena of photonic resonators have been rediscovered, and analogous theoretical approaches have been developed, thus initializing novel classes of applications. The uniqueness of nanoresonators is that the large local electromagnetic-field enhancement is accompanied by a small mode volume, which allows improving fluorescence due to the Purcell effect and realizing permanent modification of materials in nanolithography. Non-classical light–matter interaction phenomena including strong coupling and collective emission as well as lasing have unique characteristics originating from the involved plasmonic modes. Thus, it becomes possible to realize all-optical signal processing, to catch and monitor individual as well as interacting molecules in intracavity sensing, and to localize them by overcoming the diffraction limit in imaging. Moreover, light–matter interaction phenomena can be completely controlled in space and time simultaneously in predesigned nanoresonators.

As a guest editor at the Nanomaterials journal of MDPI, I would like to call your attention to the Special Issue on “Plasmonics Nanoresonators”. We welcome submissions of both original research papers and reviews on this topic.

Dr. Mária Csete
Guest Editor

Manuscript Submission Information

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Keywords

  • resonant structure
  • mode confinement
  • plasmonic mode
  • fluorescence enhancement
  • strong coupling
  • collective emission
  • lasing
  • intracavity sensing
  • subdiffraction-limited imaging
  • adaptive control

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Published Papers (4 papers)

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Research

17 pages, 6900 KiB  
Article
Towards Digital Twins of Plasmonic Sensors: Constructing the Complex Numerical Model of a Plasmonic Sensor Based on Hexagonally Arranged Gold Nanoparticles
by Attila Bonyár and Rebeka Kovács
Nanomaterials 2023, 13(14), 2044; https://doi.org/10.3390/nano13142044 - 11 Jul 2023
Cited by 3 | Viewed by 1409
Abstract
In this work, we aim to design the digital twin of a plasmonic sensor based on hexagonally arranged ellipsoidal gold nanoparticles fixed to a glass substrate. Based on electron microscopy images of three experimentally realized nanoparticle arrangement types, we constructed numerical models in [...] Read more.
In this work, we aim to design the digital twin of a plasmonic sensor based on hexagonally arranged ellipsoidal gold nanoparticles fixed to a glass substrate. Based on electron microscopy images of three experimentally realized nanoparticle arrangement types, we constructed numerical models in environments based on finite element method (FEM) and boundary element method (BEM), namely COMSOL Multiphysics for FEM and the MNPBEM Matlab Toolbox for BEM. Models with nonperiodic and periodic boundary conditions with different unit cells were constructed to study the plasmonic behavior of both the single ellipsoidal particles and the hexagonal nanoparticle arrangements. The effect of the geometrical parameters, namely the interparticle distance, the nanoparticle diameter and thickness, on the resulting LSPR peak positions and bulk refractive index sensitivities were studied in detail, also taking into account the effect of the SiO2 substrate (pillars) under the ellipsoidal particles. We have demonstrated that by optimizing the models, the LSPR peak positions (and sensitivities) can match the experimentally measured values within 1 nm (nm/RIU) precision. The comparison of simulation conditions and the detailed discussion of the effect of the geometrical parameters and used gold dielectric functions on the obtained sensitivities can be very beneficial for the optimization of plasmonic sensor constructions through numerical simulations. Full article
(This article belongs to the Special Issue Plasmonic Nanoresonators)
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9 pages, 1747 KiB  
Article
Miniaturized Spoof Plasmonic Antennas with Good Impedance Matching
by Yi Ren, Jingjing Zhang, Xinxin Gao, Xin Zheng, Le Peng Zhang and Tie Jun Cui
Nanomaterials 2023, 13(1), 136; https://doi.org/10.3390/nano13010136 - 27 Dec 2022
Cited by 3 | Viewed by 1855
Abstract
The ability of spoof surface plasmon polaritons (SSPPs) to confine electromagnetic fields in a subwavelength regime enables the design of miniaturized antennas. However, the impedance matching scheme for miniaturized spoof plasmonic antennas has not been studied systematically. In this paper, we propose a [...] Read more.
The ability of spoof surface plasmon polaritons (SSPPs) to confine electromagnetic fields in a subwavelength regime enables the design of miniaturized antennas. However, the impedance matching scheme for miniaturized spoof plasmonic antennas has not been studied systematically. In this paper, we propose a general method in the antenna design based on SSPPs, providing a feasible solution to impedance matching at the feeding point of miniaturized spoof plasmonic antennas. To verify the method, a prototype of a planar spoof plasmonic dipole antenna is simulated, fabricated and measured, of which the dipole arm length is reduced by 35.2% as compared with the traditional dipole antenna. A peak gain level of 4.29 dBi and the radiation efficiency of about 94.5% were measured at 6 GHz. This general method can be extended to solve the impedance matching problem in the design of other spoof plasmonic devices. Full article
(This article belongs to the Special Issue Plasmonic Nanoresonators)
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20 pages, 3024 KiB  
Article
Plasmonically Enhanced Superradiance of Broken-Symmetry Diamond Color Center Arrays Inside Core-Shell Nanoresonators
by Dávid Vass, András Szenes, Balázs Bánhelyi and Mária Csete
Nanomaterials 2022, 12(3), 352; https://doi.org/10.3390/nano12030352 - 22 Jan 2022
Cited by 5 | Viewed by 2837
Abstract
Superradiance was demonstrated in broken-symmetry arrays of SiV diamond color centers embedded into concave plasmonic nanoresonators. The coupled configurations, including the diamond-silver (bare) and diamond-silver-diamond (coated) nanoresonators’ geometry parameters as well as the emitters’ azimuthal orientation and distance from the metal, were numerically [...] Read more.
Superradiance was demonstrated in broken-symmetry arrays of SiV diamond color centers embedded into concave plasmonic nanoresonators. The coupled configurations, including the diamond-silver (bare) and diamond-silver-diamond (coated) nanoresonators’ geometry parameters as well as the emitters’ azimuthal orientation and distance from the metal, were numerically optimized. An objective function consisting of the total fluorescence enhancement multiplied by the corrected emission quantum efficiency was used to design nanoresonators that promote superradiance. A larger total fluorescence enhancement was achieved via a larger number of emitters in both geometries, in coated spherical and in bare ellipsoidal nanoresonators. The superradiance performance was better in the case of a smaller number of emitters in bare spherical and coated ellipsoidal nanoresonators and in the case of a larger number of emitters in coated spherical and bare ellipsoidal nanoresonators. Ellipsoidal geometry is advantageous independent of composition and seeding. The configurations optimal for non-cooperative fluorescence enhancement and superradiance are coincidental. A radiative rate enhancement proportional to the number of emitters was found in wide spectral regions; therefore, superradiance implies N-fold enhancements coexist at excitation and emission. In ellipsoidal nanoresonators, the better superradiance achieved via a smaller quality-factor is accompanied by larger frequency pulling. Full article
(This article belongs to the Special Issue Plasmonic Nanoresonators)
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18 pages, 2505 KiB  
Article
Active Individual Nanoresonators Optimized for Lasing and Spasing Operation
by András Szenes, Dávid Vass, Balázs Bánhelyi and Mária Csete
Nanomaterials 2021, 11(5), 1322; https://doi.org/10.3390/nano11051322 - 17 May 2021
Cited by 9 | Viewed by 2331
Abstract
Plasmonic nanoresonators consisting of a gold nanorod and a spherical silica core and gold shell, both coated with a gain layer, were optimized to maximize the stimulated emission in the near-field (NF-c-type) and the outcoupling into the far-field (FF-c-type) and to enter into [...] Read more.
Plasmonic nanoresonators consisting of a gold nanorod and a spherical silica core and gold shell, both coated with a gain layer, were optimized to maximize the stimulated emission in the near-field (NF-c-type) and the outcoupling into the far-field (FF-c-type) and to enter into the spasing operation region (NF-c*-type). It was shown that in the case of a moderate dye concentration, the nanorod has more advantages: smaller lasing threshold and larger slope efficiency and larger achieved intensities in the near-field in addition to FF-c-type systems’ smaller gain and outflow threshold, earlier dip-to-peak switching in the spectrum and slightly larger far-field outcoupling efficiency. However, the near-field (far-field) bandwidth is smaller for NF-c-type (FF-c-type) core–shell nanoresonators. In the case of a larger dye concentration (NF-c*-type), although the slope efficiency and near-field intensity remain larger for the nanorod, the core–shell nanoresonator is more advantageous, considering the smaller lasing, outflow, absorption and extinction cross-section thresholds and near-field bandwidth as well as the significantly larger internal and external quantum efficiencies. It was also shown that the strong-coupling of time-competing plasmonic modes accompanies the transition from lasing to spasing occurring, when the extinction cross-section crosses zero. As a result of the most efficient enhancement in the forward direction, the most uniform far-field distribution was achieved. Full article
(This article belongs to the Special Issue Plasmonic Nanoresonators)
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