LSPR Tuning of Ag@SiO2 Core-Shell Nanosphere Trimer Configurations

摘要

Electromagnetic illumination can excite the collective oscillations of free electrons around the nanoparticles which arises to an optical phenomenon called LSPR (localized surface plasmon resonance). This LSPR effect enhances and localizes the electromagnetic field in the near vicinity of nanoantenna. Metal nanoparticle clusters with core-shell structures are promising structures providing highly localized E-field within the core-shell crevices and at the junction between the nanoparticles called “hot-spots” and can detect a small amount of analyte in spectroscopic sensing techniques such as surface enhanced Raman spectroscopy (SERS)1.