Comparative Analysis of Optical Spectra of Plasmonic Nanoparticles of Different Geometrical Shapes

Mekshun, A. V.; Moritaka, S. S.; Kondorskii, A. D.; Лебедев, В. С.

doi:10.3103/s1068335620090031

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…Further, altering the shape of the NPs alters their scattering and resonance properties. Different NP shapes interact with light in different ways due to variations in their surface area and scattering cross-sections, and exhibit distinct plasmon resonances due to variations in their geometry and electron confinement [59][60][61]. The nanostructures achieve extra plasmon resonance modes when their symmetry is modified, which are longitudinal and transverse surface plasmon resonances.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Simon,

Chauhan

2024

J. Opt.

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Magnetic field enhanced laser absorption on a metallic surface incorporated with shape-dependent nanostructures

Simon,

Chauhan

2024

J. Phys. B: At. Mol. Opt. Phys.

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This communication proposes an analytical model that investigates the nanoparticle-based nonlinear absorption phenomenon associated with an obliquely incident p-polarized laser beam on a metallic surface. In this scheme, the surface is ingrained with noble-metal spherical nanoparticles (SNPs) and cylindrical nanoparticles (CNPs) in the presence of an external static magnetic field. The absorption of laser energy in the presence of nanoparticles (NPs) is attributed to surface plasmon resonance and enhanced magnetic-field effects. The absorption phenomenon was significantly enhanced by the incorporation of nanostructures and a magnetic field. The ellipticity characterizing parameter, which significantly influences resonant frequency of different nanometric structures have also been analysed and discussed. The effects of varying the magnetic field intensity, incident angle, size, and spacing of the NP were examined to determine their influence on the anomalous absorption of the laser. Furthermore, a direct dependency was found between the absorption coefficient and transmission coefficient of the incident laser, as well as the dimensions of the NPs. Several applications have direct relevance to this study, including biosensors such as DNA sensors and immunosensors, photothermal therapy, photoacoustic imaging, optoelectronic devices, solar cells, and surface-enhanced Raman spectroscopy.

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Near-Field Electromagnetic Coupling Effects in Optical Spectra of One-Dimensional and Two-Dimensional Arrays of Metal Nanoparticles

Mekshun

Moritaka

Kondorskiy

2021

Bull. Lebedev Phys. Inst.

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Comparative Analysis of Optical Spectra of Plasmonic Nanoparticles of Different Geometrical Shapes

Cited by 6 publications

References 17 publications

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Magnetic field enhanced laser absorption on a metallic surface incorporated with shape-dependent nanostructures

Near-Field Electromagnetic Coupling Effects in Optical Spectra of One-Dimensional and Two-Dimensional Arrays of Metal Nanoparticles

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