Non-local effects in the plasmons of strongly interacting nanoparticles, dimers, and waveguides

Non-local effects in the optical response of noble metals are shown to produce significant blueshift and near-field quenching of plasmons in nanoparticle dimers, nanoshells, and thin metal waveguides. Compared with a local description relying on the use of frequency-dependent dielectric functions, we predict resonance shifts as large as 10% and field-intensity reduction of an order of magnitude at inter-particle distances or metal thicknesses below 2 Å. Our results are based upon the specular-reflection model combined with a suitable non-local extension of measured local dielectric functions. We present a roadmap to design plasmon resonances in nanometer metallic elements with application to optical antennas and improved photovoltaic, light-emitting, and sensing devices.

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