The generation of strain induced by irradiation of light.
The current theory of the photostrictive effect holds that the
irradiation of light (ultraviolet rays) on an asymmetric piezoelectric ferroelectrics produces an
electric field by the photovoltaic effect, and it causes a mechanical distortion of the material by
the piezoelectric effect. A common material that shows the photostriction is PLZT.
Lightstricitive actuator, Piezoelectric effect