Narrowband optical interactions in a plasmonic nanoparticle chain coupled to a metallic film.
We study the coupling of localized surface plasmon (LSP) and surface-plasmon polariton (SPP) modes in a system composed of a metallic nanoparticle chain separated from a thin metallic film by a dielectric spacer. The thickness of such a spacer influences the level of interaction between LSP and SPP modes and controls the electromagnetic enhancement in this system. An enhancement with narrow resonances can be observed for appropriate parameters. The high-resonance quality factor and tunability of this system make it a very promising candidate for biosensing and surface-enhanced spectroscopy applications.
Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), EPFL-STI-NAM, ELG Station 11, CH-1015 Lausanne, Switzerland. daniele.brunazzo@epfl.ch
Daniele
D
Brunazzo
Emiliano
E
Descrovi
Olivier J F
OJ
Martin
D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D055620:Optical Phenomena; D012822:Silicon Dioxide / Q000737:chemistry
D008670:Metals; D012822:Silicon Dioxide