Abstract

An enhanced absorption spectrum by Fano interference is proposed to measure the tunneling between a discrete state and a continuum in asymmetric quantum wells (QWs). Interestingly, the asymmetry of the enhanced absorption spectrum is sensitive to tunneling strength, which can be used to measure the tunneling in QWs. Further study shows that the asymmetry of a nonlinear absorption spectrum is greater than that of a linear absorption spectrum, indicating better probe sensitivity. The simulation results show that the probe sensitivity based on nonlinear absorption is approximately 10 times larger than that of linear absorption. In addition, the effects of control-field intensity and detuning on probe sensitivity are evaluated.

© 2020 Optical Society of America

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