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Physical Review A

Analog to electromagnetically induced transparency and Autler-Townes effect demonstrated with photoinduced coupled waveguides

Charles Ciret, M. Alonzo, Virginie Coda, Andon A. Rangelov, Germano Montemezzani

Published Jul 25, 2013• 19 citations
Publisher

Abstract

It is shown that light transfer between two evanescently coupled optical waveguides can be interrupted when strong interaction with a third waveguide is induced. In the strong-interaction regime the transfer can be reactivated upon proper detuning of the waveguide propagation constants. These phenomena can be easily understood using the analog of Autler-Townes splitting and electromagnetically induced transparency from atomic physics. Experimental demonstration is provided using photoinduced reconfigurable waveguides.

DOI
10.1103/physreva.88.013840

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It is shown that light transfer between two evanescently coupled optical waveguides can be interrupted when strong interaction with a third waveguide is induced. In the strong-interaction regime the transfer can be reactivated upon proper detuning of the waveguide propagation constants. These phenomena can be easily understood using the analog of Autler-Townes splitting and electromagnetically induced transparency from atomic physics. Experimental demonstration is provided using photoinduced reconfigurable waveguides.
Electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are two phenomena that can affect the transmission of a probe field in the presence of a stronger field, both yielding transparency in the absorption profile. Being able to discriminate these two similar but distinct phenomena is of vital importance. Here we propose a scheme to describe the EIT and ATS phenomena in a plasmonic system. The proposed system consists of one radiative resonator and one subradiant resonator in metal-insulator-metal waveguide, and the transition is observed from the ATS model to the EIT model through three qualitative regions as the coupling strength decreases. In addition, we apply the method proposed by Anisimov to the induced transparency spectrum in our model, and numerically discerning EIT from ATS based on the Akaike's information criterion in a clear way.
Electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting are two phenomena that could be featured in a variety of three-level atomic systems. The considered phenomena, EIT and AT, are similar ``looking'' in the sense that they are both characterized by a reduction in absorption of a weak field in the presence of a stronger field. In this paper, we explicitly set the threshold of separation between EIT and AT splitting in a unified study of four different three-level atomic systems. Two resonances are studied and compared in each case. A comparison of the magnitudes of the resonances reveals two coupling-field regimes and two categories of three-level system.
We report an experimental observation of Autler-Townes doublet splitting in electromagnetically induced transparency (EIT) resonance. The splitting is introduced by a coherent microwave field, which perturbs a three-level A-type EIT system through an auxiliary level. The doublet splitting of EIT resonance is demonstrated in two cases, where the microwave field shares a common lower level with coupled or probe transition, respectively. The dependence of doublet splitting on microwave field intensity and detuning is measured. This may provide a feasible way of manipulating the atomic states with both laser and microwave field.