Physics – Quantum Physics
Scientific paper
2002-07-03
Optics and Spectroscopy 94, 829 (2003)
Physics
Quantum Physics
9 pages, 5 figs, Proceedings of ICQO'2002, Raubichi, to appear in Optics and Spectroscopy
Scientific paper
Within the framework of quantization of the macroscopic electromagnetic field, a master equation describing both the resonant dipole-dipole interaction (RDDI) and the resonant atom-field interaction (RAFI) in the presence of dispersing and absorbing macroscopic bodies is derived, with the relevant couplings being expressed in terms of the surroundings-assisted Green tensor. It is shown that under certain conditions the RDDI can be regarded as being governed by an effective Hamiltonian. The theory, which applies to both weak and strong atom-field coupling, is used to study the resonant energy exchange between two (two-level) atoms sharing initially a single excitation. In particular, it is shown that in the regime of weak atom-field coupling there is a time window, where the energy transfer follows a transfer-rate law of the type obtained by ordinary second-order perturbation theory. Finally, the spectrum of the light emitted during the energy transfer is studied and the line splittings are discussed.
Dung Ho Trung
Knoll Ludwig
Welsch Dirk-Gunnar
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