Radiative heat transfer with a cylindrical waveguide decays logarithmically slow

Abstract

Radiative heat transfer between two far-field-separated nanoparticles placed close to a perfectly conducting nanowire decays logarithmically slow with the interparticle distance. This makes a cylinder an excellent waveguide which can transfer thermal electromagnetic energy to arbitrary large distances with almost no loss. It leads to a dramatic increase of the heat transfer, so that, for almost any (large) separation, the transferred energy can be as large as for isolated particles separated by a few hundred nanometers. A phenomenologically found analytical formula accurately describes the numerical results over a wide range of parameters.

Main text: 6 pages, 4 figures; supplemental material: 10 pages, 6 figures. Changes compared to v1: Figs. 4 and S6 are added (together with the corresponding two new sections in the SM); the inset of Fig. 2 is changed; one more inset is added to Fig. 3; additional information regarding the system parameters is added

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