Tuning the resonance frequency of metamaterial nanoparticles: Silver core and PVP cladding

Abstract

Silver nanoparticles are often used as optical resonator or scatterer in different opto-electrical devices. But being a metal, high ohmic loss will occur because absorption and scattering both peaks arises at the same resonating frequency. To overcome this limitation, separation of absorption peak and scattering peak is very much needed. So in this work we present a method using metamaterial incorporating Poly Vinyl Pyrrolidone (PVP) capped silver nanoparticles which is able to decouple the absorption and scattering peak successfully with changing the thickness of the cladding layer. Study and analysis has been done to tune the resonance frequency shift between the absorption and scattering peak by varying cladding thickness. A shift of 116nm between resonating frequency of absorption and scattering efficiencies is observed for 50nm PVP cladding on core of 100nm diameter of silver nanoparticles.