Multi-layered plasmonic cloaks to engineer the scattering signature of resonant nanoparticles

Plasmonic nanoparticles have been proposed for a variety of sensing applications, due to their strong localized resonances. In a different field, plasmonic shells have been used to suppress the scattering of arbitrary objects, realizing invisibility and transparency. Exploiting the passivity requirements on frequency dispersion, we combine these seemingly unrelated concepts and show that multilayered plasmonic cloaks may be used to tailor at will the scattering response of small particles. We put forward an exciting venue to realize ultranarrow scattering features in small nanoparticles, of great interest for optical tagging and for sensing applications.