Comparison of three EIT-type resonances formed in Rb nanocell

Abstract

The electromagnetically induced transparency (EIT) phenomenon is studied using a nanometric thin (L = 795 nm) Rb vapour layer. EIT-type resonances that are formed in three different energy-level systems are reported. It is demonstrated that the EIT resonance which is formed in a Λ-system where the ground levels are separated by the hyperfine splitting (EIT_H-resonance) has the smallest linewidth (~10 MHz). The EIT resonance which is realized in a Λ-system formed by the Zeeman sublevels of the F_g = 2 → F_e = 1 transition (EIT_Z-resonance) has a larger linewidth (~14 MHz). The EIT_V-resonance which is formed in the V-system has the largest linewidth (~40 MHz). The uniqueness of the EIT phenomena reported here is that they can be formed in different types of Λ-systems even for L < 1 μm. The splitting of the EIT_Z-resonance into two components in a transverse magnetic field is reported. The theoretical model well describes the experiment.