Hyperbolic waveguide for long-distance transport of near-field heat flux
  Heat flux exchanged between two hot bodies at subwavelength separation distances can exceed the limit predicted by the blackbody theory. However this super-Planckian transfer is restricted to these separation distances. Here we demonstrate the possible existence of a super-Planckian transfer at arbitrary large separation distances if the interacting bodies are connected in near-field with weakly dissipating hyperbolic waveguides. This result opens the way to long distance transport of near-field thermal energy. 
Riccardo Messina, Philippe Ben-Abdallah, Brahim Guizal, Mauro Antezza,   Svend-Age Biehs
cond-mat.mes-hall