Subir Ghosh, Santanu K. Maiti
The possibility of spontaneous photon pair emission from a normal material - metamaterial junction is investigated in a quantum field theory setting. We consider a pair of photons arising from vacuum fluctuations of the electromagnetic field close to the junction such that one photon is in the normal sector and the other in the metamaterial sector. Since they will have opposite phase velocities this can give rise to spontaneous photoemission. The photoemission rate is derived.
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http://arxiv.org/abs/1306.3748
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