Surface plasma resonance characteristics of cylindrical multilayer metal‐coated silicon nanoparticles

Abstract

In this article, the light scattering properties of cylindrical, three‐layer, silver‐coated silicon nanoparticles of the same size are investigated. Based on the T‐matrix methods, the light transmission and reflection characteristics of the multilayer structure are strictly derived. The scattering cross section (SCS) of the system and the near‐field Hz distribution are numerically calculated. The results show that surface plasmas (SPs) with different frequencies in the outer interface between the metal shell and air can be excited by the incident light and were resonant in different cavities formed by the silver‐coated silicon nanoparticles. When the incident light has higher frequencies, the SPs are excited at the inner interface between the silver shell and the silicon rod by the penetration of the light into the metal shell, and are resonant in the internal dielectric nuclei. These special SPs resonant phenomena have broad applications in the fields of surface plasma resonance sensors and detector.