Coherent control of some optical properties in a system of molecular magnets

Abstract

A scheme is proposed for the coherent control of some optical properties in a crystal of molecular magnets based on the density matrix approach. It is shown that in the presence of a uniform dc magnetic field and two ac magnetic fields with different frequencies, the dispersion and absorption properties of the system of molecular magnets can be efficiently controlled. In particular, it is found that the probe absorption can be converted to probe amplification. Simultaneously, the superluminal light propagation changes to the subluminal propagation of the light pulse. The controllable optical multistability is then discussed for the system under consideration. The medium proposed here is a solid. Thus, because of its flexible design and the long relaxation times, it may open up an avenue to explore possibilities for quantum and nonlinear optics, as well as quantum information processing in condensed-state materials, and may result in striking effects on technology.