The Casimir effect for thin plasma sheets and the role of the surface plasmons

TL;DR

This paper analyzes the Casimir force between dielectric bodies and thin plasma sheets, emphasizing the significant role and interplay of surface plasmons and photon modes in the force's magnitude.

Contribution

It investigates the contributions of surface plasmons and photon modes to the Casimir force in plasma models, highlighting large compensations especially at large distances.

Findings

Large compensations between plasmon modes and photon modes at large distances

Surface plasmons significantly influence the Casimir force

Careful separation of vacuum energy contributions is necessary at large separations

Abstract

We consider the Casimir force betweeen two dielectric bodies described by the plasma model and between two infinitely thin plasma sheets. In both cases in addition to the photon modes surface plasmons are present in the spectrum of the electromagnetic field. We investigate the contribution of both types of modes to the Casimir force and confirm resp. find in both models large compensations between the plasmon modes themselves and between them and the photon modes especially at large distances. Our conclusion is that the separation of the vacuum energy into plasmon and photon contributions must be handled with care except for the case of small separations.