Surface Plasmon’s Dispersion Properties of Porous Gold Films

Abstract

Nanostructure porous films with arrays of gold nanoparticles (Au NPs) have been produced by pulsed laser deposition. Dispersion properties of surface plasmons have been studied by the modulation-polarization spectroscopy technique. The dispersion relations for radiative modes and two types of non-radiative modes of localized and propagating surface plasmons were obtained. The branches of propagating modes were characterized by negative group velocity caused by spatial dispersion of dielectric function. The propagating modes are caused by dipole-dipole interactions between adjacent Au NPs. The frequencies and relaxation parameters of surface plasmon resonances and the plasma frequencies for Αu NPs were obtained. The relation between the surface plasmon’s properties and formation conditions of films with arrays of Αu NPs is discussed.

Plasmonic Effects in Tin Disulfide Nanostructured Thin Films Obtained by the Close-Spaced Vacuum Sublimation

“…In particular, the extremum at negative value of ρ(λ) in a shortwavelength range around λ LSP~5 00 nm indicates to the resonant excitations of localized surface plasmons (LSP) on grains or surface inhomogeneity due to resonant interactions simultaneously for s-and p-polarized radiation. On the other hand, positive extremum of ρ(λ) in a long-wavelength range around λ SPP~6 25 nm indicates to the surface plasmonpolaritons (SPP) excitations on film/air interface (interface between film and air), or between adjacent grains, due to predominance of resonant interactions for p-polarized radiation [24]. Similar effects of plasmon's resonances have been observed in a work [39] for semiconductor nanostructures.…”

“…The aim of this work is to study the plasmonic effects in the nanostructured SnS 2 thin films deposited by CSS method utilizing the modulation-polarization spectroscopy (MPS) technique. This optical technique is effective for diagnostics and characterization of the SPR features in nanosized films of noble metals and metal-dielectric nanocomposites [9,[23][24][25][26]. The dependence of plasmonic effects on surface morphology and structural features is studied by measuring of parameter of the polarization difference ρ(θ, λ, d), where θ, λ, dthe incident angle of light, wavelength and sample thickness, respectively.…”

Love Wave Surface Acoustic Wave Sensor with Laser-Deposited Nanoporous Gold Sensitive Layer

“…As can be seen in Figure 1, the morphology of the surface was similar for the polymer surface before and after a gold layer was deposited on it. This result is for a relatively low deposition pressure (450 mTorr Ar), which implies a large energy of the gold species incident onto the polymer surface [28,32,42]. The nanoporous gold layers on the SAW sensors which were tested were deposited at a higher deposition pressure of 4 Torr, which leads to a lower energy of the incident species due to hydrodynamic effects in the laser ablation plasma [32].…”

Antireflection properties of composite zeolite gold nanoparticles film

“…The amplitude reduction of ρ(θ) that occurs at the wavelength for zeolite/Au composite films is caused by the presence of AuNPs, which can interact with incident radiation due to the resonant excitation of localised surface plasmons (LSP). Depending on the morphology of the surface of the nanostructure (size, shape, spatial distribution of NPs), the LSP can be excited both on separated non-interacting AuNPs and also between non-separated AuNPs, because of electrodynamic and dipole-dipole interaction [15]. LSP excitation leads to stronger light scattering and absorption, and thus an enhancement of the local electromagnetic field.…”

“…The mixture was then deposited onto a (111) p-type Si substrate by means of a spinning procedure and subsequently annealed at 120°C for 3 h. This resulted in a thin layer made of zeolite held together by a carbon paste. This process is characterised by a relatively low curing temperature, while the choice of oils to be used was made according to the number of double carbon bonds it had (the more the better), or equivalently, a higher iodine value [15]. The AuNPs were directly deposited onto the zeolite surface with an erosion torch by PLD, whose characteristics are reported in The PLD process was carried out in a 70-Pa argon-saturated atmosphere with the use of 3 × 10 3 laser pulses.…”