Abbreviated Journal Title
Appl. Phys. Lett.
Cascaded field enhancement in silver dimer nanostructures is investigated using a dipole-dipole interaction model. Field enhancement spectra are evaluated as a function of the particle size difference and inter-particle spacing. We observe three distinct regimes of cascaded field enhancement: hindered cascading, multiplicative cascading, and the ultimate cascading limit, depending on the dimer interaction strength. Multiplicative cascading at small inter-particle spacing leads to analytic expressions for the ultimate internal and external field enhancement factors. For silver dimers in a host with index 1.5, we obtain a maximum internal field enhancement of 2.9 X 10(3), a factor of 75 larger than that of an isolated silver nanoparticle.
Applied Physics Letters
Toroghi, Seyfollah and Kik, Pieter G., "Cascaded plasmon resonant field enhancement in nanoparticle dimers in the point dipole limit" (2012). Faculty Bibliography 2010s. 3395.