Photostrictive actuators - New perspective - New p

Photostrictive materials, exhibiting light-induced strains, are of interest for future generation wireless remote control photo-actuators, micro-actuators, and micro-sensors applications. (Pb, La)(Zr, Ti) O₃ (PLZT) ceramics doped with WO₃ exhibit large photostriction under uniform illumination of nearultraviolet light. Using a bimorph configuration, a photo-driven relay and a micro walking device have been demonstrated. However, for the fabrication of these devices, higher response speed must be achieved. The present paper reviews some theoretical models for the photovoltaic effect first, then enhanced performance through sample thickness and surface characteristics, finally its potential future applications.