Kinetic theory of electroconductivity of metal nanoparticles in the condition of surface plasmon resonance

This paper presents a theory that allows one to calculate the energy absorbed by spheroidal metal nanoparticles when irradiated by ultrashort laser pulses of different duration in the region of surface plasmon resonance. Simple analytical expressions are obtained to calculate the absorption energy dependent on the frequency of carrier laser wave, on the pulse duration, and on the ratio between the axes of the ellipsoids. It is shown that at the frequency of the carrier (laser) wave, which coincides with that of the surface plasmon, the maximum absorption is observed for spherical nanoparticles. As the carrier frequency deviates from the surface plasmon one, two maxima appear in the absorption spectrum, dependent on the ratio of spheroidal axes: one corresponds to the elongated particles and the other to the flattened ones.

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“…, vr E r tis called magnetic (Wm) one. Turning to the Fourier representation, relation (8) can be rewritten as follows:…”

Section:  mentioning

confidence: 99%

“…Another feature that effects the absorption is associated with the shape of nanoparticles. Earlier, it was shown that in the case of asymmetric metal nanoparticles, the optical conductivity, which is determined by the electrical absorption and the width of the plasmon resonance line, becomes a tensor value [8].…”

Section: Introductionmentioning

confidence: 99%

Kinetic theory of absorption of ultrashort laser pulses by ensembles of metallic nanoparticles under conditions of surface plasmon resonance

Biliuk¹,

Semchuk²,

Havryliuk³

2022

Him. Fiz. Tehnol. Poverhni

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“…72nd h. This may indicate some variations in the excitation of SPR, thus enhancing the production of AgNPs from wet biomass as observed for Bacillus subtilis (NCIB 3610)[40].…”

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confidence: 84%

Affinity capture of escherichia coli pathotypes using poly-L-lysine functionalized silver nanoparticles

Daramola¹,

Torimiro²,

Alayande³

2022

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this study, optical detection of different pathotypes of diarrhoeagenic Escherichia coli (E. coli) was exploited using biosynthesized silver nanoparticles (AgNPs) poly-coated with Poly-L-lysine hydrobromide (PLL) and monitored at 540 nm wavelength. A colour change from reddish-brown to colourless (with brown precipitates) with different absorbance values was obtained for each pathotype within two hours of interaction. The bio-affinity sensing and selective adhesion of poly-coated AgNPs (PLL-AgNPs) and E. coli strains were best observed in Enteroaggregative E. coli (0.067 ± 0.004) and Shiga toxin E. coli (0.070 ± 0.002). Slight differences in the negatively charged O-antigen present in E. coli pathotypes informed their varying binding affinity with PLL-AgNPs. Diarrhoeagenic E. coli monitoring using PLL-AgNPs and optical sensing method is a promising approach toward preventing the use of unsafe water and improving public health.

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“…The advantage of this method is its simplicity and the possibility to obtain results for a wide range of wavelengths in one calculation, as well as the option to set the properties of materials at any point of the calculation grid, which allows considering anisotropic, dispersed and nonlinear media. This method can be accurately applied to general electromagnetic structures, including arbitrarily shaped particles [15][16][17][18][19].…”

Section: Theorymentioning

confidence: 99%

Optical characteristics of structures with silicon nanowires and metal nanoparticles

Havryliuk,

Tkachuk,

Terebinska

et al. 2024

physics

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To calculate the optical parameters, the finite difference method in the time domain (FDTD) was used, which can be applied to solve Maxwell’s equations. A large number of combinations of a planar structure with metal nanoparticles and a structure with nanowires and metal nanoparticles (NPs) were calculated. The height of nanowires h varied from 50 to 3000 nm, the period of the structure P was 100–600 nm, and the diameter of metal nanoparticles d was 50–400 nm. The reduction of light reflection was determined by the anti-reflection effect of the Si-NWs array itself and the direct scattering effect of metal nanoparticles. It was shown that all structures gave significantly lower reflection coefficients compared to that of a solid silicon plate.

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Kinetic theory of electroconductivity of metal nanoparticles in the condition of surface plasmon resonance

Cited by 20 publications

References 7 publications

Kinetic theory of absorption of ultrashort laser pulses by ensembles of metallic nanoparticles under conditions of surface plasmon resonance

Kinetic theory of absorption of ultrashort laser pulses by ensembles of metallic nanoparticles under conditions of surface plasmon resonance

Affinity capture of escherichia coli pathotypes using poly-L-lysine functionalized silver nanoparticles

Optical characteristics of structures with silicon nanowires and metal nanoparticles

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