"Dynamical Casimir effect for surface plasmon polaritons" The title says it all, in terms of hitting on two of the significant new catch-phrases which are cropping up in the glow-stick version of LENR, but the paper (from Estonia) is behind a paywall. http://www.sciencedirect.com/science/article/pii/S0375960114012195
Ostensibly, it would explain how the SPP can become excessively energetic in circumstances which are relatively mundane. One message that is emerging is that SPP formation could be gainful in itself, despite whatever happens next. One photon going in with two coming out. provides a mechanism for gain if the wavelength is the same. Abstract The emission of photon pairs by a metal-dielectric interface placed between the mirrors of the resonator and excited by a plane wave is considered. The excitation causes oscillations in time of the optical length of surface plasmon polaritons in the interface. This leads to the dynamical Casimir effect - the generation of pairs of surface plasmon polariton quanta, which transfer to photons outside the interface. In the case of a properly chosen interface, the yield of two-photon emission may exceed that of the usual spontaneous parametric down-conversion.
