Optical properties of aggregates of small metal particles

The Change of the Surface Morphology and Optical Properties During the Heat-Treatment for Silver Films Deposited on Silicas

“…It has been reported that the aggregation of particles brings about the absorption wavelength shift because of electromagnetic multipole interactions between particles within an aggregate [11,12]. The parallelism of the absorption spectra change due to the change of micro-structure (from dense packing of particles to the island-like structure) was also obtained in the present study.…”

Tunable Localized-Surface-Plasmon-Resonance Characteristics of Independently Prepared Ag-TiO2 Particles

“…Additionally, the red shift of the absorption peak wavelength of metal particles also occurred due to the change of particle size toward larger one [8] and the aggregation of metal particles [9,10]. In the case of Ag-TiO 2 particles in the present study, since TiO 2 particles existed between Ag particles, both of the particle growth and aggregation of Ag particles less oc- curred compared in the absence of TiO 2 particles.…”

Optically Anisotropic Metal‐Polymer Nanocomposites

“…They found in the example of spheric gold particles with diameters below 50 nm that the intensity loss of transmitted light originated predominately from absorption [24][25][26][27]; considerable scattering arose only for gold particles with diameters above ~50 nm [28,29]. In particle arrays such as present in the dichroic nanocomposites referred to below, it must be considered that the color of nanoparticles can depend not only on the size of the particles but also on the distance between the particles [30,31]. This was realized about 100 years ago when Kirchner and Zsigmondy reported that nanocomposites of gelatin and colloidal silver [32] or gold [33] reversibly changed their color from blue to red upon swelling with water.…”