Effects of dielectric core and embedding medium on plasmonic coupling of gold nanoshell arrays

Zhou, Xin; Li, Hongjian; Xie, Suxia; Fu, Shaoli; Xu, Hui; Liu, Zhimin

doi:10.1016/j.ssc.2011.04.014

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…4 and 5 , in vacuum, the interparticle coupling is suppressed due to the absence of a dielectric environment. When the surrounding medium is a dielectric, it also polarizes with the plasmonic nanoparticles in response to the incident field, thereby enhancing the interparticle coupling 37 , 38 . Thus, in vacuum ( n = 1), it takes just a short interparticle distance for the nanoparticles to become isolated from interparticle interactions (Fig.…”

Section: Resultsmentioning

confidence: 99%

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Borah

Ninakanti

Bals

et al. 2022

Sci Rep

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While the behaviour of plasmonic solid thin films in the Kretschmann (also known as Attenuated Total Reflection, ATR) configuration is well-understood, the use of discrete nanoparticle arrays in this optical configuration is not thoroughly explored. It is important to do so, since close packed plasmonic nanoparticle arrays exhibit exceptionally strong light-matter interactions by plasmonic coupling. The present work elucidates the optical properties of plasmonic Au and Ag nanoparticle arrays in both the direct normal incidence and Kretschmann configuration by numerical models, that are validated experimentally. First, hexagonal close packed Au and Ag nanoparticle films/arrays are obtained by air–liquid interfacial assembly. The numerical models for the rigorous solution of the Maxwell’s equations are validated using experimental optical spectra of these films before systematically investigating various parameters. The individual far-field/near-field optical properties, as well as the plasmon relaxation mechanism of the nanoparticles, vary strongly as the packing density of the array increases. In the Kretschmann configuration, the evanescent fields arising from p- and s-polarized (or TM and TE polarized) incidence have different directional components. The local evanescent field intensity and direction depends on the polarization, angle of incidence and the wavelength of incidence. These factors in the Kretschmann configuration give rise to interesting far-field as well as near-field optical properties. Overall, it is shown that plasmonic nanoparticle arrays in the Kretschmann configuration facilitate strong broadband absorptance without transmission losses, and strong near-field enhancement. The results reported herein elucidate the optical properties of self-assembled nanoparticle films, pinpointing the ideal conditions under which the normal and the Kretschmann configuration can be exploited in multiple light-driven applications.

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Section: Resultsmentioning

confidence: 99%

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Borah

Ninakanti

Bals

et al. 2022

Sci Rep

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“…If the particles size is larger than the quasistatic limit, the Mie theory is applicable and higher multipole modes dominate in the calculated extinction cross-section spectra [18]. The time-dependent local density approximation (TDLDA) [19] and discrete dipole approximation (DDA) [20] are some methods for investigating the properties of metal nanoshell. Using these methods and with the development of computers, simulation of scattering and extinction coefficient data for comparison with the experimental data and prediction of optical properties is possible.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface plasmon resonance on optical response in dielectric (core)–metal (shell) nanoparticles

Shayesteh

Saie

2015

Pramana - J Phys

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In this work, we present the effect of refractive index of an embedding medium, core and shell having various sizes of metallic nanoshells on the surface plasmon resonance (SPR) properties in the spherical dielectric-metal core-shell nanoparticles based on the quasistatic approaches and Mie theory. For the metallic nanoshell with dimensions comparable to the wavelength of light, the quasistatic approximation shows good agreement with the Mie theory results. However, for large nanoparticles the quasistatic approximation is not appropriate and Mie theory illustrates SPR due to dipole and quadrupole in extinction cross-section. The typical cross-section calculations show two peaks that related to inner and outer surfaces. The dimensional dependence of optical constant in the Drude model leads to a decrease in plasma absorption in metal core-shell. By increasing the shell radius and therefore increasing the metal content the SPR at the outer surface shifts to higher energy and the weaker peak (at inner surface) shifts to lower energy. Also, depending on the metal shell materials SPR occurs in different energy regions and therefore can be tuned the SP frequency at higher energy by changing the shell materials. In addition, SPR frequency is sensitive to variation in refractive index of the environment of core-shell.

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“…In particular, gold nanoshells have attracted significant attention for its application in biotechnology and biomedicine [2][3][4][5][6][7][8][9][10][11] because of its good biocompatibility and high chemical stability in addition to its tunable optical properties. e occurrence of morphology-dependent LSPRs in metallic nanostructures has stimulated numerous simulation studies [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. e simulation of interaction of light with metallic nanostructures is an important part of the scientific progress in the plasmonic field.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of the Optical Response of Silicon/Silica/Gold Multishell Nanoparticles in Biological Tissue

Chaâbani

Chehaidar

Proust

et al. 2019

Advances in Materials Science and Engineering

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e scattering and absorption efficiencies of light by a single silicon/silica/gold spherical multishell in biological tissues are analyzed theoretically in the framework of Lorenz-Mie theory and finite-difference time-domain formalism. We first revised the ideal case of a concentric silicon/gold nanoshell, analyzed the effect of growing a silica layer of uniform thickness around the silicon core, and then examined the effect of an offset of the gold shell with respect to the centre of the silicon/silica nanoshell. Our simulation showed that the silicon/gold nanoshell in the biological tissue supports significant absorption and scattering resonances in the biological spectral window. On the contrary, the growth of a silica layer on the silicon core surface leads to a blueshift of these resonances accompanied by a slight increase of their magnitudes. e offset of the gold shell with respect to the silicon/ silica core results in a redshift of the absorption and scattering resonances supported by the concentric silicon/silica/gold multishell within the biological window, accompanied by a decrease in their amplitudes. On the contrary, the gold shell offset gives rise to a more prominent electric field enhancement at the silicon/silica/gold multishell-biological tissue interface. Our simulation thus shows that silicon/silica/gold multishell nanoparticles are potential candidates in bioimaging and photothermal therapy applications.

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Effects of dielectric core and embedding medium on plasmonic coupling of gold nanoshell arrays

Cited by 12 publications

References 22 publications

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

The effect of surface plasmon resonance on optical response in dielectric (core)–metal (shell) nanoparticles

Theoretical Analysis of the Optical Response of Silicon/Silica/Gold Multishell Nanoparticles in Biological Tissue

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