I need to know about optical switch for my optoelectronics course for physics majors. So far I only know its a switch which is controlled by light. I tried to search net but couldn't find any thing. Is optical switch have another name?
I'm confused about nonlinear material and from where that blue light came? don't we need some kind of photon bombardment . . .As a first example, we illustrate the behavior of our switch, shown to the right. In this device, a single beam of light (blue) is emitted from a nonlinear material and exits in a certain direction. This is one of the two states of the switch; let's call it the "off" state. The switch is turned to the "on" state, when a second light beam, the switching beam (red), is injected into the nonlinear optical material. As a result, the output beam (blue) is emitted in a different direction.