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Abstract
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Nanoantennas made of spheroidal metal nanoparticles are studied
as a function of several parameters, namely aspect ratio, volume, background
index and metal. Single nanospheroids are analysed using the polarisability
theory with radiative and depolarisation corrections, while double spheroids
are investigated using the finite-difference time-domain method. We focus
on the spectral position of the plasmon resonance and on the scattering
efficiency for applications related to the fluorescence enhancement of emitters.
We show that a careful choice of the parameters allows covering wavelengths
ranging from the UV to the near IR spectrum, while keeping the scattering
efficiency close to 100%. We also discuss the role of the optical constants
in determining the nanoantenna performances.
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