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Journal of Modern Optics

Permanent dipole moments induced new coherent effects in absorption and dispersion of a three-level molecule

Guoli Ma, Baoguo Shi, Yanli Yao, Hongyan Guo, Weibo Liu

Published Mar 10, 2010• 4 citations
Publisher

Abstract

We study the effects of quantum coherence induced by permanent dipole moments in a three-level dipolar molecule. We find that the absorption and dispersion properties can be significantly modified by this coherence under different conditions. It is shown that electromagnetically induced transparency, enhancement of the index of refraction, lasing without population inversion, and anomalous dispersion are all dependent on this interference.

DOI
10.1080/09500341003672049

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We study the effects of quantum coherence induced by permanent dipole moments in a three-level dipolar molecule. We find that the absorption and dispersion properties can be significantly modified by this coherence under different conditions. It is shown that electromagnetically induced transparency, enhancement of the index of refraction, lasing without population inversion, and anomalous dispersion are all dependent on this interference.
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Electromagnetically induced transparency (EIT) in a molecular three-level Λ system with permanent dipole moments and undergoing m- and n-photon transitions by pump and probe lasers is investigated. Analytical expressions are derived for probe absorption spectrum and dispersion for a medium of stationary as well as thermal molecules. Contrary to the earlier study by Zhou et al. [J. Chem. Phys. 131, 034105 (2009)], we observe no amplification in 2 + 2 photon process when the sign of the difference of the permanent moments of the excited and the ground levels is reversed. Reasons for these contrasting observations are discussed. Our study shows that the permanent moments essentially damp the laser-molecule Rabi frequency to result in narrower EIT line width and larger group velocity index. These effects are further enhanced when the order of the multi-photon process is increased. The importance of the virtual mechanism is discussed by considering the special case of 2 + 1 photon EIT.
This paper presents the current results of field-induced quantum interference in semiconductor quantum wells. Three-level systems with two conduction subbands in single and double quantum wells coupled by a resonant field are studied. We investigate effects of the Coulomb and field-induced electronic renormalizations of the energy subbands and steady eigenstates of electrons. The random-phase and ladder approximations have been used to calculate the linear interband and intersubband optical absorptions and refractive indices. The effect of collective dipole moment on the nonlinear susceptibility has been incorporated into the study by using a local-field approach. Lasing without population inversion, electromagnetically induced transparency, and enhanced nonlinearity with reduced absorption inside the intersubband-coupled single quantum well and dc-field coupled double quantum wells are found.
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