On The Phase Of The Electric Field In Optical Antennas

Abstract : We study the phase of the electric field in the vicinity of two electric dipoles transversely coupled in two fundamental cases: a nanogap antenna illuminated from the far field and a directive antenna made of a single metallic particle coupled to an electric source dipole. We will link the scattering efficiency of the dimer (first case) and the directivity of the particle antenna (second case) to the relative phase of the two dipoles. The strong distance dependence of this phase term produces two unexpected effects: the bonding transverse mode can be the brightest mode of a nanogap antenna; and the emission directivity offered by a metallic particle can be tuned by varying the emitter/particle distance at a strongly sub- wavelength scale.
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Submitted on : Wednesday, November 2, 2011 - 5:12:11 PM
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Brice Rolly, Brian Stout, Sébastien Bidault, Nicolas Bonod. On The Phase Of The Electric Field In Optical Antennas. The fourth international workshop on theoretical and computational nanophotonics: TaCoNa-Photonics 2011, Oct 2011, Bad Honnef, Germany. pp.88-90, ⟨10.1063/1.3644221⟩. ⟨hal-00637711⟩



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