2019/06/05 by Dev Kumar Thapa, Thapa, Dev Kumar, Subham Kumar Saha +9
Engineering · Materials Science · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Laser-Ablation Synthesis of Nanoparticles #Materials Science (cond-mat.mtrl-sci) #Nanocluster Synthesis and Applications #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.1906.05342
openalex publication_date 2019/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This article describes the optical properties of nanostructures composed of silver particles embedded into a gold matrix. In previous studies these materials were shown to exhibit temperature dependent transitions to a highly conductive and strongly diamagnetic state. Here we describe the anomalous optical properties of these nanostructures. Most notably, these materials fail to obey Mie theory and exhibit an unconventional resonance with a maximum at about 4 eV, while the usual gold and silver localized surface plasmon resonances are suppressed. This effect implies a significant deviation from the bulk dielectric functions of gold and silver. We further resolved this resonance into its absorbance and scattering sub-parts. It is observed that the resonance is largely comprised of scattering, with negligible losses even at ultraviolet frequencies.