Published works have predicted that the radiative transfer from a heated metal to a lossless dielectric a short distance away is many orders of magnitude times the free-space Planck density. It is shown analytically that the radiative transfer from a heated metal to a lossless dielectric of index n₃ is n₃²e₁₃ times the free-space Planck density, where e₁₃ is the emissivity of the metal radiating into the lossless dielectric. This radiative transfer is never larger than n₃² (approximately one order of magnitude for semiconductors in the infrared) times the free=space Planck density. The expressions presented show that the maximum radiative transfer from a lossy metallic heat source with a dielectric function of imaginary part ∊_I must be proportional to n₃³/√∊_I, of which a factor of n₃² arises from the power density within a dielectric and a factor of n₃/ √∊_I arises from the emissivity of a metal radiating directly into a dielectric.

© 2000 Optical Society of America

[Optical Society of America ]

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