On the Equation which Governs Cavity Radiation II

Progress in Physics. 2014;10(3):157-162


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Journal Title: Progress in Physics

ISSN: 1555-5534 (Print); 1555-5615 (Online)

Publisher: HEXIS (Arizona)

LCC Subject Category: Science: Physics

Country of publisher: United States

Language of fulltext: English

Full-text formats available: PDF



Robitaille P.-M.


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Abstract | Full Text

In this work, the equation which properly governs cavity radiation is addressed once again, while presenting a generalized form. A contrast is made between the approach recently taken (P.M.Robitaille. On the equation which governs cavity radiation. Progr. Phys. , 2014, v. 10, no. 2, 126–127) and a course of action adopted earlier by Max Planck. The two approaches give dramatically differing conclusions, highlighting that the derivation of a relationship can have far reaching consequences. In Planck’s case, all cavities contain black radiation. In Robitaille’s case , only cavities permitted to tem- porarily fall out of thermal equilibrium, or which have been subjected to the action of a perfect absorber, contain black radiation. Arbitrary cavities do not emit as black- bodies. A proper evaluation of this equation reveals that cavity radiation is absolutely dependent on the nature of the enclosure and its contents. Re cent results demonstrating super-Planckian thermal emission from hyperbolic metamaterials in the near field and emission enhancements in the far field are briefly examined. Such findings highlight that cavity radiation is absolutely dependent on the nature of the cavity and its walls. As previously stated, the constants of Planck and Boltzmann can no longer be viewed as universal.