Spontaneous emission of an atom near an oscillating mirror

Abstract

We investigate the spontaneous emission of one atom placed near an oscillating reflecting plate. We consider the atom modeled as a two-level system, interacting with the quantum electromagnetic field in the vacuum state, in the presence of the oscillating mirror. We suppose that the plate oscillates adiabatically, so that the time-dependence of the interaction Hamiltonian is entirely enclosed in the time-dependent mode functions, satisfying the boundary conditions at the plate surface, at any given time. Using time-dependent perturbation theory, we evaluate the transition rate to the ground-state of the atom, and show that it depends on the time-dependent atom-plate distance. We also show that the presence of the oscillating mirror significantly affects the physical features of the spontaneous emission of the atom, in particular the spectrum of the emitted radiation. Specifically, we find the appearance of two symmetric lateral peaks in the spectrum, not present in the case of a static mirror, due to the modulated environment. The two lateral peaks are separated from the central peak by the modulation frequency, and we discuss the possibility to observe them with actual experimental techniques of dynamical mirrors and atomic trapping. Our results indicate that a dynamical (i.e. time-modulated) environment can give new possibilities to control and manipulate also other radiative processes of two or more atoms or molecules nearby, for example their cooperative decay or the resonant energy transfer.

arXiv comment11 pages, 3 figures

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Cited by in corpus (7)

• Shaking photons from the vacuum: acceleration radiation from vibrating atoms
• Motion induced excitation and radiation from an atom facing a mirror
• Temporal factorization of a non-stationary electromagnetic cavity field
• Collective spontaneous emission of two entangled atoms near an oscillating mirror
• Motion induced excitation and electromagnetic radiation from an atom facing a thin mirror
• Dynamical atom-wall Casimir-Polder effect after a sudden change of the atomic position
• Direct space-time modeling of mechanically dressed dipole-dipole interactions with electromagnetically-coupled oscillating dipoles