Invitación al seminario del Profesor George C. Schatz
This talk will overview the interplay between optics, plasmonics, and excitonics for systems that consist of arrays of gold, silver or aluminum nanoparticles in 1D, 2D and 3D. Two kinds of arrays will be considered, those involving DNA-linked nanoparticles in 3D with subwavelength particle spacings, and those involving 2D arrays of particles where the spacing satisfies a diffraction condition that produces hybrid plason-photonic excitations known as lattice plasmons. The emphasis of the DNA—linked nanoparticle structures will be on describing scattering and extinction experiments where issues such as effective medium approximations and Fabry-Perot cavity modes are important. I also describe DNAlinked structures with embedded dyes, and structures that combine magnetic and plasmonic properties.
The studies of lattice plasmons include unusual extinction and scattering properties of the lattices that include quadrupole resonances effects for aluminum lattices, and lattice plasmon lasers in which laser dyes are added to the nanoparticle lattices and where the theory needs to combine electrodynamics with a quantum description of the dye photophysics. I will also talk about recent work on exciton transfer between dye molecules that is mediated by plasmonic nanoparticles.