The Fano Effect and Its Consequences

Joachim Keßler, J. Lorenz

Bibhas Kumar Dutta, Pradipta Panchadhyayee

Abstract A four-level atomic model is proposed to exhibit the evolution of Fano-like interference effect in the spontaneous emission spectrum of Autler-Townes (AT) doublet when the atom is initially prepared in the phase-dependent superposition of quantum states. By using this model, phase-dependent generation of a narrow spectral line within the AT-doublet is predicted. This feature is shown to be modified by the AT-peak-splitting effect. In addition, it has been also shown that the latter may be accompanied by an anomalous peak shifting effect, which is found to be obtained in a typical phase-coherent atomic ensemble or phaseonium under consideration. As a whole, the emission spectrum can be obtained with three peaks instead of two peaks associated with a sharp spectral hole as a consequence of the emergence of asymmetric Fano-like resonance. This is the most interesting outcome of the present study.

G. Lozano C., O. B. Silva, F. A. Ferri +2 more

Abstract It is crucial to control the tuning and improve the emission of a quantum emitter at the nanoscale. We report multiple Fano resonances in metallic nanostructures on an Er 3+ -doped tellurite glass. Periodic nanoslits were fabricated with a focused gallium ion beam on a gold thin film deposited on the tellurite glass. Is proposed a coupling function with Fano line-shape form, and the asymmetric parameter q for each resonance wavelength in the 515 to 535 nm region was calculated. This asymmetric resonance effect is a consequence of the quantum interaction between the continuum state, generated in the nanostructure, and the Stark splits of the $$^2$$ 2 H $$_{11/2}$$ 11 / 2 state.

K. Særmark, Jacob Levitan, M. Lewkowicz

G. Lozano C., V.A.G. Rivera, O. B. Silva +2 more

Multiple Fano resonances were observed in plasmonic nanostructures on Er3+-doped tellurite glass. Our coupling function exhibits an asymmetric Fano line-shape form as a consequence of the interaction between the nanostructure and the Er3+: 2H11/2 state.

Сатанин Аркадий Михайлович, Yong Suk Joe