Abstract
The optical magnetoelectric (OME) effect based on electromagnon resonance has been investigated in a multiferroic helimagnet ${\mathrm{MnWO}}_{4}$ with the canted spin-spiral plane by the terahertz spectroscopy. Versatile OME effects emerge from the canted spin-spiral state, including the magnetochiral effect as manifested by the nonreciprocal directional dichroism. In addition to the transverse fluctuation mode of the spin-driven ferroelectric polarization, the electromagnon with a character of the longitudinal amplitude mode was found to cause the OME effect characteristic of the canted spin-spiral plane.
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