In this work, we numerically investigate the surface plasmon resonance (SPR) effects on a pair of rotational silver nanorod/nanoshell dimer with a finite height of 1000 nm by means of finite element method with three dimensional calculation. The rotational angles of the silver nanorod/nanoshell dimer are chosen θ=0°, θ=25°, θ=45° and θ=90°, respectively. The proposed structure exhibits a red-shifted localized SPR that can tuned over an extended wavelength range by varying the dielectric constant in metal nanoshell and the rotational angle of the silver nanorod/nanoshell dimer. The tunable optical properties on SPR phenomena are attributed to the rotational effect and a larger effective size of dielectric constant that is filled with a higher refractive medium of finite height of metal nanorod/nanoshell. This unique property of a pair of rotational nanorod/nanoshell dimer is highly attractive for serving as resonant center to hold and probe smaller nanostructures, such as biomolecules or quantum dots. Such structures also show significant promise for applications in nano-switch devices, sensing, and surface-enhanced spectroscopy, due to their strong and tunable plasmon resonances.
KEYWORDS: Silver, Near field, Particles, Solids, Super resolution, Surface plasmons, Nanoparticles, Near field optics, Data storage, Finite-difference time-domain method
In this paper, the surface plasmon resonance (SPR) effects between solid silver (Ag) and Ag-shell nanoparticles (MNPs) in active layer of AgOx-type super-resolution near-field structure (super-RENS) are numerically investigated and quantitatively compared by means of finite-difference time-domain method. Eight types of MNPs patterns, i.e., structure #1-#8 in active layer of super-RENS are studied. Results show that the proposed structure #3 and #7 in active layer shows higher field intensity than other structures corresponding to their SPR wavelengths. It is found that the structure #7 (square Ag-shell of MNPs) is the best choice in the view point of designing the AgOx-type super-RENS. This study provides the information to design a super-RENS with superior resolution as well as other applications in nanophotonic devices.
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