Dark resonance formation with magnetically-induced transitions: extension of spectral range and giant circular dichroism

Abstract

Dark resonances were formed via electromagnetically induced transparency for the first time involving magnetically-induced $\Delta F=\pm 2$ atomic transitions of alkali metal atom, which are forbidden at zero magnetic field. The probability of these transitions undergoes rapid growth when $300-3000$~G magnetic field is applied, allowing formation of dark resonances, widely tunable in the GHz range. It is established that for $\Delta F=+2$ ($\Delta F=-2$) transition, the coupling laser tuned to $\Delta F=+1$ ($\Delta F=-1$) transition of the hyperfine $\Lambda$-system must be ${\sigma }^{+}$ (${\sigma }^{-}$) polarized, manifesting anomalous circular dichroism.

5 pages, 6 figures

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