Quantum interference in the fluorescence of a molecular system

Wang, J., Wiseman, H. M. and Ficek, Z. (2000) Quantum interference in the fluorescence of a molecular system. Physical Review A, 62 013818: 013818-1-013818-10. doi:10.1103/PhysRevA.62.013818

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Author Wang, J.
Wiseman, H. M.
Ficek, Z.
Title Quantum interference in the fluorescence of a molecular system
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2000
Sub-type Article (original research)
DOI 10.1103/PhysRevA.62.013818
Open Access Status File (Publisher version)
Volume 62
Issue 013818
Start page 013818-1
End page 013818-10
Total pages 10
Place of publication College Park, MD
Publisher American Physical Soc
Collection year 2000
Language eng
Subject C1
240402 Quantum Optics and Lasers
780102 Physical sciences
Abstract It has been observed experimentally [H.R. Xia, C.Y. Ye, and S.Y. Zhu, Phys. Rev. Lett. 77, 1032 (1996)] that quantum interference between two molecular transitions can lead to a suppression or enhancement of spontaneous emission. This is manifest in the fluorescent intensity as a function of the detuning of the driving field from the two-photon resonance condition. Here we present a theory that explains the observed variation of the number of peaks with the mutual polarization of the molecular transition dipole moments. Using master equation techniques we calculate analytically as well as numerically the steady-state fluorescence, and find that the number of peaks depends on the excitation process. If the molecule is driven to the upper levels by a two-photon process, the fluorescent intensity consists of two peaks regardless of the mutual polarization of the transition dipole moments. Lf the excitation process is composed of both a two-step, one-photon process and a one-step, two-photon process, then there are two peaks on transitions with parallel dipole moments and three peaks on transitions with antiparallel dipole moments. This latter case is in excellent agreement with the experiment.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Spontaneous-emission Cancellation
Electromagnetically Induced Transparency
Inversion
Laser
Mechanisms
Atoms
Gain
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Mon, 13 Aug 2007, 11:50:46 EST