Localized surface plasmons in face to face dimer silver triangular prism nanoparticles

Abstract

Using the discrete dipole approximation method, all plasmonic bands in 80 nm silver face to face dimer triangular prism nanoparticles were reported. The characteristics of plasmonics peaks were investigated with variations of dimer gap and refractive index of the surrounding medium of dimer. We found that there are three and four plasmonic bands, respectively, for dimer separation 2 and 4 nm. The extinction spectra and electric field distribution showed that the dipole–dipole interaction creates strong plasmonic band, but the quadrupole–quadrupole interaction relates to weak plasmonic band. The results revealed that the strong plasmonic bands have high sensitivity factors with respect to weak plasmonic bands. This study may be used in the synthesis of asymmetric dimers made of metal nanoparticles with new plasmonics properties.

Effect of Geometrical Properties on Localized Surface Plasmon Resonance of Gold Nanoparticles

“…This region is thus named hotspot. Light-matter interaction reinforces in this confined region [4,[18][19][20][21][22][23][24]. It is therefore expected to improve the sensing performance.…”

Supershape Nanoparticle Plasmons

“…The resonant interaction between electron-charged oscillations near the surface of the metal and the electromagnetic field of the light creates the localized plasmons [18]. It is well known that the characteristic of localized plasmons in nanoparticles strongly depends on the size, shape, the interparticle separation, the refractive index of the sensed medium, and dispersed material [19]. In most cases, the sensory elements are not spherical, but they are non-spherical and more complex [20].…”