Relating localized nanoparticle resonances to an associated antenna problem

Details Relating localized nanoparticle resonances to an associated antenna problem Relating localized nanoparticle resonances to an associated antenna problem

2010-10-14

arxiv.org/abs/1010.2972v1

Physics

Optics

Submitted to Phys. Rev. B

Scientific paper

We conceptually unify the description of resonances existing at metallic nanoparticles and optical nanowire antennas. To this end the nanoantenna is treated as a Fabry-Perot resonator with arbitrary semi-nanoparticles forming the terminations. We show that the frequencies of the quasi-static dipolar resonances of these nanoparticles coincide with the frequency where the phase of the complex reflection coefficient of the fundamental propagating plasmon polariton mode at the wire termination amounts to $\pi$. The lowest order Fabry-Perot resonance of the optical wire antenna occurs therefore even for a negligible wire length. This approach can be used either to easily calculate resonance frequencies for arbitrarily shaped nanoparticles or for tuning the resonance of nanoantennas by varying their termination.

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