Enhanced dispersion interaction in confined geometry
Michal Marcovitch, Haim Diamant
Abstract
The dispersion interaction between two point-like particles confined in a dielectric slab between two plates of another dielectric medium is studied within a continuum (Lifshitz) theory. The retarded (Casimir-Polder) interaction at large inter-particle distances is found to be strongly enhanced as the mismatch between the dielectric permittivities of the two media is increased. The large-distance interaction is multiplied due to confinement by a factor of (33γ5/2+13γ-3/2)/46 at zero temperature, and by (5γ2+γ-2)/6 at finite temperature, γ=(0)/(0) being the ratio between the static dielectric permittivities of the inner and outer media. This confinement-induced amplification of the dispersion interaction can reach several orders of magnitude.
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