Enhanced UV plasmon resonance in oscillating silicon nanoparticles

Enhanced plasmonic UV (UltraViolet) scattering and absorption occur due to the excitation of electric resonance modes in silicon (Si) nanoparticles, making them suitable for UV spectroscopy and soft optical metamaterial applications. Integrating Si nanoparticles into soft material gives the tunability, efficiency, and scalability necessary to attain active metamaterials. Exciting surface plasmon resonances in the UV achieves tunability and amplified scattering and absorption in Si nanoparticles. The existing solutions to explain the localized surface plasmon resonance in Si nanoparticles contain infinite series expansions, which limits the basic understanding of the dominant mode behavior. We propose a spherical wave impedance-based approach, which applies fundamental principles from linear circuit theory. It defines impedance as the ratio between electric and magnetic fields, allowing us to derive expressions for various cross sections. Comparison with the electromagnetic field solution (Mie solution) establishes a close match for the scattering, absorption, and extinction response. The model is compact and explains the transfer of energy utilizing lumped circuit components, which is valuable for developing rapid designs of Si nanoparticle-based soft optical metamaterials and metasurfaces.