Self-dressing Fano interference controlled by various crystal phase transition

Abstract

We study the self-dressing Fano interference controlled by different phase transitions of rare-earth-doped ions. The self-dressing Fano interference originates from Pr3+: Y2SiO5, Eu3+/Pr3+: YPO4, and Eu3+: BiPO4 at different laser power and time-gate. We explore that the self-dressed Fano exhibits photon dressing and crystal field splitting in Pr3+: Y2SiO5 and Eu3+/Pr3+: YPO4, respectively. We report that Pr3+: Y2SiO5 depict the strongest narrow single Fano, results from the narrow scanning spectrum range (3 nm) and single-level photon dressing only; however, Eu3+: BiPO4 exhibit the most prominent broad multi-level Fano among other three atomic-like mediums, due to coexisting photon-phonon dressing and a large range of spectrum scanning wavelength (40 nm). For the first time, we observe the smooth evolution of Fano interferences from self-dressing Fluorescence (FL) Fano to hybrid (FL + SFWM) Fano and to self-dressing spontaneous four-wave mixing (SFWM) in different samples of Eu3+: BiPO4 by changing the time-gate. We disclose that the Eu3+: BiPO4 sample (6:1) exhibits strong Fano interference in contrast with samples (7:1) and (1:1) owing to more sample phonon dressing in the (6:1) sample. Further, we compare the self-dressing Fano with the external-dressing Fano and notice that the Fano switch in self-dressing Fano results from the different Eu3+: BiPO4 samples transitions owing to distinct samples different detunings. However, the Fano switch in external-dressing Fano is obtained by changing the time-gate, owing to the cross and self-Kerr nonlinear phase difference. We further declare the strongest self-dressing FL Fano interference compared to the external-dressing FL Fano interference due to the double cascade dressing.