Tuesday, February 12, 2013

1302.2464 (Ephraim Shahmoon et al.)

Dispersion forces inside metallic waveguides    [PDF]

Ephraim Shahmoon, Gershon Kurizki
We consider the dispersion energy of a pair of dipoles embedded in a metallic waveguide with transverse dimension $a$ smaller than the characteristic dipolar wavelength. We find that $a$ sets the scale that separates retarded, Casimir-Polder-like, from quasistatic, van der Waals-like, interactions. Whereas in the retarded regime, the energy decays exponentially with inter-dipolar distance, typical of evanescent waves, in the van der Walls regime, the known free-space result is obtained. This short-range scaling implies that the additivity of the dispersion interactions inside a waveguide extends to denser media, along with modifications to related Casimir effects in such structures.
View original: http://arxiv.org/abs/1302.2464

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