Metal film light modulator

摘要

An improved device for modulating the intensity of a light beam is described which comprises a first isoceles optical prism; a first dielectric layer, a thin metallic layer, and a second dielectric layer substantially identical in composition and thickness to the first dielectric layer deposited successively on the base of the first prism; a second isoceles optical prism disposed with the base thereof contacting the last deposited layer; and a controllable source of electrical current connected to the metallic layer for establishing and modulating an electro-magnetic field at the respective surfaces of the metallic layer.