　This book offers academics, chemists, and engineers an essential resource for understanding the molecular photoswitches and provides a guide to the development of new photoresponsive materials. The author explores the reaction mechanism, photoswitching performance, photoswitchable crystals and myriad applications based on diarylethene and its derivatives to single-molecule optical memory media, single-molecule conductance photoswitches, field-effect transistors, metal-organic frameworks, super-resolution fluorescence microscopy, color dosimeters, and photocontrollable drugs.