Heat & radiation

  Radiation Pressure from a hot-plate can in principle counteract Casimir attraction

 Near-field effects: At short separations exponentially decaying evanescent waves are dominant sources of heat transfer and pressure.

 The near field waves are excited at specific material resonant frequencies    which can be tuned to generate repulsion.

 "Dilution and resonance-enhanced repulsion in nonequilibrium fluctuation forces,"

G. Bimonte, T. Emig, M. Kruger, & M. Kardar, Phys. Rev. A 84, 042503 (2011)

  Example of non-equilibrium Casimir levitation: M. Krüger, G. Bimonte, T. Emig, and M. Kardar, Phys. Rev. B 86, 115423 (2012)

 A hot micro-sphere can levitate on top of a cold plate: Falls down if it cools down (due to heat transfer),

Next (Engine) Outline Casimir force Repulsion? Earnshaw's theorem Heat Engine Friction Summary

  Stefan-Boltzmann law suggest that heat transfer between two bodies is independent of their separation. Is this true?

 Breaking the law, at the nanoscale (MIT news, July 29, 2009)  S. Shen, A. Narayanaswamy, & G. Chen, Nano Lett. 9, 2909 (2009)