Z-scan studies of the nonlinear optical properties of gold nanoparticles prepared by electron beam deposition

Abstract

This paper details the fabrication process for placing single-layer gold (Au) nanoparticles on a planar substrate, and investigation of the resulting optical properties that can be exploited for nonlinear optics applications. Preparation of Au nanoparticles on the substrate involved electron beam deposition and subsequent thermal dewetting. The obtained thin films of Au had a variation in thicknesses related to the controllable deposition time during the electron beam deposition process. These samples were then subjected to thermal annealing at 600°C to produce a randomly distributed layer of Au nanoparticles. Observation from field-effect scanning electron microscope (FESEM) images indicated the size of Au nanoparticles ranges from ∼13 to ∼48 nm. Details of the optical properties related to peak absorption of localized surface plasmon resonance (LSPR) of the nanoparticle were revealed by use of UV-Vis spectroscopy. The Z-scan technique was used to measure the nonlinear effects on the fabricated Au nanoparticle layers where it strongly relates LSPR and nonlinear optical properties.

Optical Nonlinear Properties of Gold Nanoparticles Synthesized by Laser Ablation in Polymer Solution

“…It has been reported that nonlinear optical properties of Au-NPs by means of electron beam deposition have been studied by employing Z-scan technique [17]. It is worth highlighting that Z-scan technique is a simple and accurate technique which can be useful in determining the nonlinear (NL) properties.…”

Optical Conduction Resonance in Self-Assembled Metal Nanoparticle Array-Dielectric Thin Films

“…Since SPR coexists in metal nanoparticles, the OCR resulting absorption should not be confused with SPR and the resulting photon absorption. The two resonances always have different frequencies [27][28][29][30][31][32]. Only when q is near zero, these two frequencies approach the same value.…”

“…Only at a very low concentration of metal nanoparticles, the OCR and surface plasmon resonance (SPR) occur at the same frequency [27,28]. As far as I know, the ion implantation laser ablation [29], electron beam deposition [30], and sputtering techniques are commonly used to fabricate metal nanoparticle-dielectric thin films with high volume fraction of metal nanoparticles. This work reports using the electrostatic self-assembly (ESA) technique to fabricate two-dimensional (2D) Au nanoparticle arraydielectric thin films containing high volume fraction of Au nanoparticles to investigate this type of resonance through theoretical calculations and experimental characterizations.…”

Влияние лазерного разрушения на нелинейно-оптические свойства core/shell наностержней Au/SiO-=SUB=-2-=/SUB=-

“…Наночастицы (НЧ) благородных металлов проявляют уникальные нелинейно-оптические свойства благодаря особому механизму взаимодействия с лазерным излучением, связанному с существованием коллективных электронных возбуждений, называемых в литературе локализованными или поверхностными плазмонами, время жизни которых ограничено и определяется электронэлектронной (∼ 10 2 fs) и электрон-фононной релаксацией (до 10 2 ps) [1][2][3][4][5].…”