The Converse Piezoelectric Effect as an Imaging Signal

Why applying a voltage locally to a piezoelectric material produces a tiny mechanical deformation whose direction reveals which way that specific spot's internal polarization points.

References

• Gruverman, A., Kholkin, A. "Nanoscale Ferroelectrics: Imaging and Control." Reports on Progress in Physics 69, no. 8 (2006): 2443–2474.