Fig. 2: SHG spectrum, line profile, and polarization dependence.
From: Writing of strain-controlled multiferroic ribbons into MnWO4
a SHG spectrum measured for the tensor component \({\chi }_{{yxx}}\). The green line shows the optical absorption spectrum measured at 15 K. b Line profile (red outline) of the SHG intensity at 6.5 K in the AF1 phase. c and d SHG polarization anisotropy with the polarization of \({E}^{2\omega }{||\; y}\) measured with varying polarization of fundamental light in the c multiferroic AF2 phase and d non-multiferroic AF1 phase. The SHG intensity from the AF1 dark bulk region (red) is one order of magnitude weaker than that in the AF1 multiferroic ribbons (blue). Solid lines are fits of the tensor component \({\chi }_{{yxx}}\).
