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Keywords = confined magnetoplasmon

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16 pages, 552 KB  
Review
Two-Dimensional Plasmons in Laterally Confined 2D Electron Systems
by Igor V. Zagorodnev, Andrey A. Zabolotnykh, Danil A. Rodionov and Vladimir A. Volkov
Nanomaterials 2023, 13(6), 975; https://doi.org/10.3390/nano13060975 - 8 Mar 2023
Cited by 14 | Viewed by 3963
Abstract
The collective oscillations of charge density (plasmons) in conductive solids are basic excitations that determine the dynamic response of the system. In infinite two-dimensional (2D) electron systems, plasmons have gapless dispersion covering a broad spectral range from subterahertz to infrared, which is promising [...] Read more.
The collective oscillations of charge density (plasmons) in conductive solids are basic excitations that determine the dynamic response of the system. In infinite two-dimensional (2D) electron systems, plasmons have gapless dispersion covering a broad spectral range from subterahertz to infrared, which is promising in light-matter applications. We discuss the state-of-the-art physics of 2D plasmons, especially in confined 2D electron systems in stripe and disk geometry, using the simplest approach for conductivity. When the metal gate is placed in the vicinity of the 2D electron system, an analytical description of the plasmon frequency and damping can be easily obtained. We also analyze gated plasmons in the disk when it was situated at various distances from the gate, and discuss in detail the nontrivial behavior of the damping. We predict that it is not a simple sum of the radiative and collisional dampings, but has a nonmonotonic dependence on the system parameters. For high-mobility 2D systems, this opens the way to achieve the maximal quality factor of plasma resonances. Lastly, we discuss the recently discovered near-gate 2D plasmons propagating along the laterally confined gate, even without applied bias voltage and having gapless dispersion when the gate has the form of a stripe, and discrete spectrum when the gate is in the form of disk. It allows for one to drive the frequency and spatial propagation of such plasmons. Full article
(This article belongs to the Special Issue Semiconductor Quantum Wells and Nanostructures)
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8 pages, 1326 KB  
Article
High-Refractive-Index Materials for Giant Enhancement of the Transverse Magneto-Optical Kerr Effect
by Edwin Moncada-Villa and J. Ricardo Mejía-Salazar
Sensors 2020, 20(4), 952; https://doi.org/10.3390/s20040952 - 11 Feb 2020
Cited by 16 | Viewed by 4120
Abstract
The ability of plasmonic structures to confine and enhance light at nanometer length scales has been traditionally exploited to boost the magneto-optical effects in magneto-plasmonic structures. These platforms allows for light control via externally applied magnetic fields, which is of prime importance for [...] Read more.
The ability of plasmonic structures to confine and enhance light at nanometer length scales has been traditionally exploited to boost the magneto-optical effects in magneto-plasmonic structures. These platforms allows for light control via externally applied magnetic fields, which is of prime importance for sensing, data storage, optical-isolation, and telecommunications applications. However, applications are hindered by the high-level of ohmic losses associated to metallic and ferromagnetic components. Here, we use a lossless all-dielectric platform for giant enhancement of the magneto-optical effects. Our structure consists of a high-refractive index dielectric film on top of a magnetic dielectric substrate. We numerically demonstrate an extraordinarily enhanced transverse magneto-optical Kerr effect due to the Fabry–Perot resonances supported by the high-refractive index slab. Potential applications for sensing and biosensing are also illustrated in this work. Full article
(This article belongs to the Special Issue Optical Nanosensors for Biosensing)
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