Theoretical Study of the Local Surface Plasmon Resonance Properties of Silver Nanosphere Clusters

Abstract

The local surface plasmon resonance properties in systems consisting of silver nanosphere clusters are studied by Green’s function. The extinction, absorption, and scattering efficiencies band of two, three, and more silver nanospheres clusters are discussed in detail. The clusters show new types of the local surface plasmon resonances compared with single silver nanosphere. Our results suggest that the resonances depend strongly on individual particles’ characteristics such as their shapes, gap distances, directions and polarizations of incident light waves, and the number of clusters. The spectrum shows that equilateral triangle nanospheres has a good absorption peak, while the better red-shifted with three aligned nanospheres. In addition, the distributions of electric field intensity for three and four touched silver nanospheres are also investigated. The study is useful to broaden the application scope of Raman spectroscopy and nanooptics.

The importance of evaluating the real metal concentration in nanoparticles post-synthesis for their applications: A case-study using silver nanoparticles

“…However, few reports have provided a detailed explanation for this fact [17][18][19][20]. These types of silver structures, such as Ag 4 þ , Ag n , and ultra-small AgNP, do not have metallic properties; consequently, they do not contribute to the silver plasmon band in the visible range, as observed by Linnert et al [20].…”

Surface Plasmon-Modulated Fluorescence on 2D Metallic Silver Gratings

“…For the former, it is the so-called local restricted electric field enhancement, which usually occurred on the surface of metal nanoparticles [15]- [16]. For the latter, Due to the surface plasmon coupled emission is related to dispersion relation of SPPs, it is often observed in the dye/metal grating composite structures [17]- [18], in accompanied with some contributions of SPPs-enhanced absorption.…”

Simulated study of plasmonic coupling in noble bimetallic alloy nanosphere arrays

“…The strength of plasmonic coupling depends on the interparticle distance and number of interacting particles. 25,26 Under parallel polarization i.e. when polarization is along the interparticle axis, as the gap between particles is reduced, red-shift in the plasmon resonance takes place along with broadening of peak.…”

“…have been proposed but DDA is considered to be the most powerful method to study the optical properties of arrays. 26,27 Therefore in this paper, DDA method 31 is used to optimize the scattering efficiency and LSPR peak position over a broad spectral region of wavelengths so that the absorption efficiency of thin-film solar cells can be enhanced. We have investigated the effect of particle interactions on the scattering efficiency and FWHM for the simplest form of array i.e., one dimensional (1D) BANS arrays because the coupling of two or more nanoparticles is also a crucial parameter for plasmonic solar cells and for designing future plasmonic devices.…”

“…along y-axis because of maximum electric-field (EF) enhancement in this direction. 26 Here, the size of individual nanoparticle, surrounding medium refractive index and size of the arrays are optimized for higher scattering and larger FWHM, so that the entire region of the visible and infrared is covered which is the essential condition to increase the efficiency of plasmonics solar cells. In previous study, 19 the effect of size, surrounding medium, and alloy composition on the scattering efficiency and FWHM has been already reported for single BANSs but for plasmonic solar cells applications, the interaction between the particles also plays an important role, therefore, the study of interactions between these BANSs is the main aim of present study.…”