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Ordered arrays of plasmonic nanostructures: from nanophotonics to biosensing.

Balasa I.G., Cesca T., Kalinic B., Maurizio C., Michieli N., Piccotti D., Mattei G.
  Martedì 12/09   09:00 - 13:00   Aula A107   II - Fisica della materia
Two-dimensional (2D) ordered arrays of plasmonic nanostructures are very flexible nanoarchitectures for achieving different optical functionalities, which exploit the interplay between the resonances of the single building block in the array unit cell and the collective lattice modes. In this talk we will review some of the results obtained by our group on three classes of Au-based 2D ordered arrays: i) NanoPrism Arrays (NPA), ii) Semi-NanoShell Arrays (SNSA) and iii) NanoHole Arrays (NHA). The first two classes sustain localized surface plasmons in the visible or near-infrared range, while the third one exploits the excitation of extended plasmons to produce the extraordinary optical transmission (EOT). Some examples will be given of the enhanced or hybrid functionalities that can be achieved in different fields of application, spanning from nanophotonics, nonlinear optics and molecular biosensing: i) near-field interaction of quantum emitters like $Er^{3+}$ ions with Au NHAs for controlling their emission efficiency; ii) nonlinear optical and dichroic properties of Au and Ag NPAs; iii) improved biomolecular sensitivity in Au-Ag alloy SNSAs.