Abstract
We investigate nonlinear Fano interference effect in time-resolved excitation spectra of Eu3+-doped microcrystals. Multiple parameters are used to control Fano interference. The transition between bright and dark states depends on the initial phase, cross-Kerr and self-Kerr nonlinear phase. Spectral Line-shape is continuously tuned by delay time, laser power, time gate width, bandwidth of laser, detector position and temperature. Two Fano dips are observed in excitation spectra. The photon–phonon dressing Fano interference model is set up to explain this phenomenon. The tunable nonlinear Fano interference line-shape may be used for quantum devices such as high-contrast all-optical switch and multi-channel optical filter.
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