Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Quanteneffekte: Interferenz und Korrelationen II
Q 40.3: Vortrag
Mittwoch, 4. März 2009, 17:00–17:15, VMP 6 HS-E
Electromagnetically induced absorption as a consequence of quantum interference — •Hsiang-Shun Chou1,2 and Jörg Evers1 — 1MPI für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan 202
Electromagnetically induced absorption (EIA) is a quantum optical effect that leads to a substantial enhancement of the absorption rate of a probe field by the presence of a coupling field. EIA has been observed in a number of different systems, such as degenerate two-level systems [1,2,3]. The signature for EIA is an additional resonance with subnatural width observed in the spectra. So far, density matrix calculations including spontaneous coherence transfer have been suggested for a description of EIA. However, for certain cases of upper state and lower state angular momentum, it was reported that the EIA spectrum can not be explained by spontaneous coherence transfer [2]. In this paper, we propose an alternative simple physical picture which helps us gain deeper insight into EIA. We show that a constructive interference, which leads to EIA, arises naturally in the dressed state basis. This treatment illustrates the essential ingredients of EIA for all cases in a clear and simple way.
[1] A. M. Akulshin et al., Phys. Rev. A 57, 2996 (1998).
[2] S.-K. Kim et al., Phys. Rev. A 68, 063813 (2003).
[3] K. Dahl et al., Opt. Lett. 33, 983 (2008).