The MOSFET, a cornerstone of modern electronics, has undergone remarkable evolution since its inception. By integrating optical control mechanisms, researchers have unlocked unprecedented capabilities, blending the speed and precision of optical signals with the robustness of traditional electronic devices. This synergy holds profound implications across a spectrum of fields-from telecommunications to quantum computing, from energy efficiency to biomedical instrumentation.This book serves as a comprehensive guide, offering a thorough exploration of the fundamental concepts underpinning optically controlled MOSFETs. It traces the evolution of semiconductor technology, delving into the physics of light-matter interactions that enable optical control. Through detailed discussions and practical examples, it elucidates the design principles, fabrication techniques, and performance metrics critical to understanding these cutting-edge devices.