Resolving Homogeneous Broadening By Multidimensional Spectroscopy In EIT Regime

It is well known that electromagnetically induced transparency(EIT)has been extensively studied in atomic or atomic-like systems since it was predicted theoretically and demonstrated experimentally.EIT occurs as a result of destructive interference between two transition pathways of an atomic medium and gives rise to a significant change in the dispersive properties of the medium within the narrow transparency region.Applications to quantum optics,quantum memory,sensing and metamaterial have been proposed.In the past,it has been studied mainly in the frequency domain using continuous-wave lasers irradiating atomic or atomic-like systems.We developed a new method,which combines the photon echo technique and EIT by extending it to the time-domain.To our knowledge it is a first practical application of the EIT effect in the field of spectroscopy.While photon echo is a conventional tool for eliminating the inhomogeneous broadening,the EIT effect allows also to resolve features smaller than the homogeneous broadening linewidth.Two-dimensional spectra will be used to visualize the molecular dynamics process simulated for a molecular dimer.