Theoretical studies of the optical properties of plasmon resonance on silver nanoparticles in the near-field optics

Abstract

Articles you may be interested inEngineering the plasmonic optical properties of cubic silver nanostructures based on Fano resonance Controlling the absorption spectrum within a thin amorphous silicon layer by using the size dependent plasmonic behaviour of silver nanoparticles J. Renewable Sustainable Energy 5, 031614 (2013); 10.1063/1.4809787Localized surface plasmon resonance of single silver nanoparticles studied by dark-field optical microscopy and spectroscopy J. Appl. Phys. 109, 034310 (2011); 10.1063/1.3544349Tunable near-infrared optical properties of three-layered metal nanoshells Near-field spectral characteristics, images, and optical parameters of silver nanoparticles are studied using Green's tensor. The Lippmann-Schwinger integral equation is discretized, and numerically solved with complex-conjugate gradient method-fast Fourier transform algorithm. Simulation models include placing nanoparticles in either an infinitely homogeneous medium or on a substrate, and illuminated either directly with plane waves or through a glass substrate under total internal reflection. Simulation results suggest that local plasmon resonance redshifts to longer wavelengths when dielectric constant of the surrounding medium increases or when a substrate is presented, but blueshifts to shorter wavelengths when the height of a nanoparticle increases. Due to the exponential attenuation behavior of evanescent waves, total intensity of electrical field attenuates quickly as the detection distance increases. Optical efficiencies, scattering efficiencies, absorption, and extinction efficiencies of Ag nanoparticles are also reported.

Theoretical Analysis the Optical Properties of Multi-coupled Silver Nanoshell Particles

“…Thanks to the product which satisfies the convulsion, we can use FFT (Fast Fourier Transform Algorithm) to accelerate it [ 30 ]. Our results confirm that CPU run time with FFT method is reduced significantly comparing to case without FFT [ 31 ].…”

“…The optical properties were previously found in experiment by Nakano [ 49 ]. These phenomenons could be explained as, due to the properties of the boundary conditions of Maxwell’s equations [ 31 , 50 ], the discontinuity of the electric field component at normal to the surface are proportional for surface’s polarized charge densities, only Ex-polarized light can excite plasmon resonances between the gap of silver nanoshell particles. Taking account of the Ez-polarized light, the boundary conditions are continuous for polarization parallel to the z-axis.…”

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

“…For the linear (Eq. 4), we could solve them effectively with complex-conjugate gradient method [25] and fast Fourier transform algorithm [26, 27]. …”

Optical performance of ultra-thin silver films under the attenuated total reflection mode

“…Ag-II shows the island uniform distributed surface, columnar structure and small sizes of grains can be found from the AFM pictures. The SEM surface of the ultra-thin silver film is similar with silver nanoparticles [15,16]. We chose part of region from SEM picture to analysis the size, the diameters of islands vary from 3.7 to 19.1 nm, and average diameter is 9.3 nm, which is much smaller than silver nanoparticles produced by spin-coated [2]or high temperature annealing method.…”