Cherenkov terahertz surface magnetoplasmons excitation by an electron beam

Srivastav, Rohit Kumar; Panwar, A.

doi:10.1063/5.0131368

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…In addition, the excited SSP mode can also be amplified by inserting some active circuit chips or other components [ 27 ], which can also be termed as “active plasmonic metamaterials”. Apart from the excitation or amplification mechanisms of SSP modes mentioned, high-power SSP emitters on meta-structure arrays using active photon or electron sources have also been largely demonstrated [ 28 , 29 , 30 , 31 , 32 , 33 ]. The working principles of the active excitation method rely on an effective dispersion match between the injected energy sources (photons or electrons) and SSP mode; thus, the interaction or amplification of the SSP mode can provide a new venue to obtain high-power radiation sources [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam

Liu,

Zhang,

Wang

et al. 2024

Micromachines

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In this paper, both fundamental SSP modes on a roofed metallic grating and its effective excitation of the bounded SSP mode by an injected electron beam on the structure are numerically examined and investigated in the THz regime. Apart from the bounded SSP mode on the metallic grating with open space, the introduced roofed metallic grating can generate a closed waveguide mode that occupies the dispersion region outside the light line. The closed waveguide mode shifts gradually to a higher frequency band with a decreased gap size, while the bounded SSP mode line becomes lower. The effective excitation of the bounded SSP mode on this roofed metallic grating is also implemented and studied by using a particle-in-cell simulation studio. The output SSP power spectrums with various gap sizes by the same electron beam on this roofed metallic grating are obtained and analyzed. The simulation results reveal that the generated SSP spectra show a slight red shift with a decreased gap size. This work on the excitation of the SSP mode using an electron beam can benefit the development of high-power compact THz radiation sources by utilizing the strong near-field confinement of SSPs on metallic gratings.

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Section: Introductionmentioning

confidence: 99%

Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam

Liu,

Zhang,

Wang

et al. 2024

Micromachines

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show abstract

“…Similarly, Kumar et al [26] proposed THz radiation through an array of magnetized anharmonic CNTs, while Ghayemmoniri et al [25] investigated THz generation in the presence of an external tapered magnetic field using CNTs. Srivastav and Panwar [46] investigated THz surface magnetoplasmons over an n-type semiconductor with an electron beam in the presence of an external magnetic field by resonant Cherenkov interaction.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Simon,

Chauhan

2024

J. Opt.

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This communication deals with the analytical study of terahertz (THz) generation via frequency-difference mechanism using two circularly symmetric Gaussian laser beams with slightly different frequencies ω1 and ω2 and wave vectors k1 and k2 simultaneously propagating through a mixture of spatially corrugated noble-metal nanoparticles. The mixture, consisting of spherical and cylindrical nanoparticles, is placed in a host medium under the influence of an externally applied static magnetic field. The two co-propagating laser beams impart a nonlinear ponderomotive force on electrons of the nanoparticles, causing them to experience nonlinear oscillatory velocity. Further, the consequent nonlinear current density excites terahertz radiation at the beat frequency (=ω1 - ω2). Magnetic field inﬂuences the surface plasmon resonance condition associated with electrons of the nanoparticles due to enhancement in ponderomotive nonlinearities, thereby causing an increment in the amplitude of generated THz field. It is observed that the generated THz radiation has a strong dependence on the shape and size of the nanoparticles in addition to the magnetic field strength. Cylindrical nanoparticles provide greater THz amplitude than spherical nanoparticles due to additional resonance modes, and combining both kinds of nanostructures further enhance the amplitude. THz radiations play an important role in biomedical and pharmaceutical fields, communications, security and THz spectroscopy.

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“…Similarly, Kumar et al [16] proposed THz radiation through an array of magnetized anharmonic CNTs while Ghayemmoniri et al [36] investigated THz generation in the presence of an external tapered magnetic field using CNTs. Srivastav and Panwar [37] investigated terahertz (THz) surface magnetoplasmons over n-type semiconductor by an electron beam in the presence of an external magnetic field by resonant Cherenkov interaction.…”

Section: Introductionmentioning

confidence: 99%

Excitation of tunable terahertz radiation from a mixture of nanoparticles in static magnetic field

Simon,

Chauhan

2023

Preprint

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This communication deals with the analytical study of terahertz (THz) generation via beat-wave mechanism of two circularly symmetric Gaussian laser beams with frequencies \({\omega }_{1}\) and \({\omega }_{2}\) and wave vectors \({\overrightarrow{k}}_{1}\) and \({\overrightarrow{k}}_{2}\)simultaneously propagating through a mixture of spatially corrugated noble-metal nanoparticles (NPs). The mixture, consisting of spherical and cylindrical nanoparticles, is placed in argon gas under the influence of a static magnetic field. The two co-propagating laser beams impart a nonlinear ponderomotive force on electrons of the NPs, causing them to experience nonlinear oscillatory velocity. Further, the consequent nonlinear current density excites terahertz radiation at the beat frequency \(\omega (={\omega }_{1}-{\omega }_{2})\). Magnetic field influences the surface plasmon resonance condition associated with electrons of the nanoparticles due to enhancement in ponderomotive nonlinearities, thereby causing an increment in the amplitude of generated THz field. It is observed that the generated THz radiation has a strong dependence on the shape and size of the NPs in addition to the magnetic field strength. Cylindrical nanoparticles provide greater THz amplitude than spherical nanoparticles due to additional resonance modes, and combining both kinds of nanostructures further enhance the amplitude. THz radiations play an important role in biomedical and pharmaceutical fields, communications, security and THz spectroscopy.

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Cherenkov terahertz surface magnetoplasmons excitation by an electron beam

Cited by 6 publications

References 37 publications

Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam

Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Excitation of tunable terahertz radiation from a mixture of nanoparticles in static magnetic field

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