Hyper-Rayleigh scattering from gold nanoparticles: Effect of size and shape

Das, Kaustuv; Uppal, Abha; Saini, R.K.; Varshney, G.K.; Mondal, Puspen; Gupta, Pooja

doi:10.1016/j.saa.2014.02.152

Cited by 14 publications

(22 citation statements)

References 37 publications

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“…It has been verified in the literature that metallic nanoparticles containing sharp tips or edges present a higher hyperpolarizability, and this value is reduced if the tips are rounded. 41 Moreover, for a given shape, the hyperpolarizability of metallic nanoparticles normalized by the square root of the number of atoms is higher the bigger the particle's diameter. 41 The nanoparticles studied in the present case do not present surface plasmon resonance (SPR), which can be verified from the lack of peaks on the attenuation spectra, since the ferrite is not a good conductor.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Influence of Magnetic Field on the Two-Photon Absorption and Hyper-Rayleigh Scattering of Manganese–Zinc Ferrite Nanoparticles

et al. 2020

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Magnetic nanoparticles based on manganese–zinc ferrite presenting spherical and cubic shapes, verified by small-angle X-rays scattering, were studied by means of the hyper-Rayleigh scattering, the Z-Scan technique in the open-aperture configuration, and a spectrally resolved femtosecond transient absorption setup. Hyper-Rayleigh scattering and Z-Scan experiments were performed with applied magnetic field parallel to the laser polarization state and in the perpendicular direction. The hyperpolarizability of spherical nanoparticles was greater than the cubic ones due to the higher volume of spherical nanoparticles and, therefore, the increased influence of the spin-disoriented layer at the surface on cubic nanoparticles, resulting in a smaller orientational average contribution to the hyperpolarizability. The two-photon absorption cross section was the same for both samples, since the basic constituents are the same and the light absorption is not influenced by the surface anisotropy present on magnetic nanoparticles. For both nanoparticles, the measured optical second harmonic and the nonlinear absorption increased during experiments performed in the presence of external field in the parallel configuration, while a decrease was verified for experiments in the perpendicular case, which demonstrates a crystalline anisotropy on the nonlinear optical properties. Transient absorption measurements revealed an ultrafast relaxation process containing at least two separated dynamical processes, the faster with characteristic time below 1 ps and a longer one, much higher than 100 ps.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Influence of Magnetic Field on the Two-Photon Absorption and Hyper-Rayleigh Scattering of Manganese–Zinc Ferrite Nanoparticles

et al. 2020

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“…(2.3.4), em que a referência utilizada foi o resultado obtido para as moléculas de para-nitroanilina, medida a 30 Hz. Posto que β pNA = 28,8 × 10 −30 cm 5 /esu [80] correspondeà hiperpolarizabilidade das moléculas de pNA dissolvidas em DMSO, pôde-se concluir que a hiperpolarizabilidade para as nanopartículas de magnetita corresponde a β OS = 8,5(1) × 10 −28 cm 5 /esu, valor comparável aquele medido para outras nanopartículas, como por exemplo nanoesferas de ouro de diâmetro similar [114], NPs de prata [115,116] e cobre [116], normalizadas pelo número deátomos.…”

Section: Determinação Da Hiperpolarizabilidadeunclassified

“…Apesar de serem constituídas do mesmo material, o valor calculado para hiperpolarizabilidade das nanopartículas esféricas, MZS, foi maior que aquele para as amostras MZC, mesmo quando o coeficiente quadrático foi estudado em função da concentração de unidades de Mn 0,5 Zn 0,5 Fe 2 O 4 . Foi verificado que nanopartículas metálicas que contém pontas acentuadas apresentam maiores valores de hiperpolarizabilidade [114], mas há uma redução nesse valor quando as pontas são arredondadas. Do mesmo modo, para persas em solução quando o número de unidades básicasé o mesmo.…”

Section: Determinação Da Hiperpolarizabilidadeunclassified

“…uma determinada forma de nanopartícula, a hiperpolarizabilidade normalizada pela raiz quadrada do número deátomos que a constituem aumenta com o tamanho da nanopartícula[114]. No presente caso, as nanopartículas estudadas não apresentam ressonância plasmônica de superfície, o que pode ser verificado pela ausência de picos no espectro de atenuação da luz.…”

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“…Além disso, a amostra MZCé formada por nanopartículas cúbicas de vértices arredondados, de modo que não há um aumento do campo local devido a extremidades acentuadas. Sendo assim, as diferenças nos valores de β verificadas entre as amostras MZS e MZC são devidas a diferença do volume total das nanopartículas, assim como verificado para nanopartículas esféricas de ouro[114]. Nanopartículas magnéticas apresentam uma estrutura do tipo núcleo-superfície com relação aos spins resultantes dosátomos.…”

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Propriedades ópticas não lineares de segunda e terceira ordem de coloides magnéticos

Gonçalves¹

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Nesse trabalho foram estudadas propriedadesópticas não lineares de segunda e terceira ordens de nanopartículas magnéticas monocristalinas, dispersas em solução coloidal. Foram investigadas soluções comerciais de partículas baseadas em magnetita, Fe 3 O 4 , bem como formadas por ferrite de manganês e zinco, Mn 0,5 Zn 0,5 Fe 2 O 4 , sintetizadas no Instituto de Física da Universidade de São Paulo em colaboração com pesquisadores da Charotar Palavras chave: Ferrofluidos, espalhamento hiper Rayleigh, hiperpolarizabilidade, varredura Z, absorção de dois fótons

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High Yield Synthesis and Quadratic Nonlinearities of Gold Nanoprisms in Solution: The Role of Corner Sharpness

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Drobnyh

Sukharev

et al. 2022

Israel Journal of Chemistry

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Size and shape of noble metal nanoparticles have a major influence on their linear and second order nonlinear properties. Among these nanostructures, acentric objects are expected to display high quadratic nonlinear responses. In this work, a single – step growth of gold nanoprisms (GNPs) was achieved by seedless growth. Their second harmonic response has been investigated experimentally and theoretically with edge length ranging from 40 to 116 nm and for different curvature radii at corners. Their first hyperpolarizabilities β have been measured by Harmonic Light Scattering at 1064 nm. Their calculated and experimental β values are found to display, not only a linear dependence with the surface area as reported for other metallic nanoparticle shapes, but also a strong influence of their corner sharpness on the corresponding nonlinearities. Such high experimental and theoretical β values of GNPs are mainly assigned to the sharpness of tips.

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Hyper-Rayleigh scattering from gold nanoparticles: Effect of size and shape

Cited by 14 publications

References 37 publications

Influence of Magnetic Field on the Two-Photon Absorption and Hyper-Rayleigh Scattering of Manganese–Zinc Ferrite Nanoparticles

Influence of Magnetic Field on the Two-Photon Absorption and Hyper-Rayleigh Scattering of Manganese–Zinc Ferrite Nanoparticles

Propriedades ópticas não lineares de segunda e terceira ordem de coloides magnéticos

High Yield Synthesis and Quadratic Nonlinearities of Gold Nanoprisms in Solution: The Role of Corner Sharpness

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