Laser Assisted Au Nanocrystal Formation in Conditions of Surface Plasmon Resonance

Abstract

The possibility of the calibrated Au nanoparticles formation in conditions of surface plasmon resonance at irradiation of the Au film/glass structure by pulsed YAG:Nd 3+ -laser radiation is investigated. Sizes of the Au fragments and their surface distribution were studied by the atom force microscopy. The effect of Au nanofragmentation was observed only at the second harmonic irradiation (λ = 0.532 µm). The large difference in the average values of Au nanoparticles sizesδ and distributions between created in the resonance conditions, R = Rmin,δ ∼ 80 nm and in case out of resonance R = Rmin,δ ∼ 1350 nm was established. A high degree of the height sizes homogeneity of Au nanoparticles has been shown by the histogram obtained from the atom force microscopy data. There was verified the conclusion about determining contribution of the plasmon subsystem field in nanofragmentation process of the Au film in the SPR conditions at high laser levels.

Nanostructuring of Continuous Gold Film by Laser Radiation Under Surface Plasmon Polariton Resonance Conditions

“…At the levels of LI P that are close to the ablation threshold P≅P tha , the regular spatial heterogeneities can appear on the metal surface in accordance with the spatial modulation of the temperature field [10][11][12] and, correspondingly, the microablation can occur. The regular periodic patterns described in [9][10][11] have been created due to the mentioned above "parasite" mechanisms of SEW excitation, related to the scattering of laser wave on phase and geometrical heterogeneities or nonlinear interactions in the strong laser fields that do not provide the reproducibility of the technological process.…”

“…In our previous work [9], we have demonstrated a thin Au film nanofragmentation by laser radiation at SPR conditions. In this work, we focus on the processes of laser energy transformation into the plasmon subsystem in the vicinity of a metal surface at the SPR conditions and possible mechanisms of nanofragmentation.…”

Self-Organization Processes of Nanostructure Formation by Laser Radiation in Metal

“…So, we emphasize that the mechanisms of the sizes reduction and stabilization of metallic NP ablated in the liquid is based on the effect of local plasmon resonance which is the main factor of self-organization. New approach in the generation of metal NP was proposed by the authors of the report at the pulse laser irradiation of the system air / Au film/ glass in condition of surface plasmon-polariton resonance SPR [ 20 ] of the initial metal solid films free of such disadvantage.…”

Plasmonic polarization-contrast imaging og aqueous solutions using two-dimensional metallic surface relief gratings

“…This enables harmonic free electrons density fluctuations within the metal layer, leading to enhanced electromagnetic fields at the metal-dielectric boundary, as well as increased transparency of the metal layer. Coupling incident light into a surface plasmon strongly depends on the optical properties of the metal and dielectric layers, the interface morphology, as well as the homogeneity of both materials [1]. Since the SPR wave vector is always larger than the incident light wave vector in the dielectric material [2], the excitation of SPR is only possible by using phase-matching techniques, such as evanescent waves from total internal reflections, also known as the Kretschmann configuration [3], and diffracted light from gratings.…”