- The science that deals with the study of, and applications of electronic components, circuits, devices, and systems which generate, transmit, receive, detect, and modulate light, especially that in the visible, infrared, and ultraviolet regions. There are many applications, including those in communications, lasers, and displays. It is sometimes utilized as a synonym for electro-optics, but this usage is incorrect. Also spelled opto-electronics. Its abbreviation is optotronics, or OE.