Near-field induction heating of metallic nanoparticles due to infrared magnetic dipole contribution

Abstract

We revisit the electromagnetic heat transfer between a metallic nanoparticle and a metallic semi-infinite substrate, commonly studied using the electric dipole approximation. For infrared and microwave frequencies, we find that the magnetic polarizability of the particle is larger than the electric one. We also find that the local density of states in the near field is dominated by the magnetic contribution. As a consequence, the power absorbed by the particle in the near field is due to dissipation by fluctuating eddy currents. These results show that a number of near-field effects involving metallic particles should be affected by the fluctuating magnetic fields.

publié dans Physical Review B 77 (2008), version avant review

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• Tomography of near-field radiative heat exchange between mesoscopic bodies immersed in a thermal bath
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