FRESNEL LENS IN ACCUMULATED OPTICAL SYSTEM

摘要

Fresnel lens for integrated optics of the type having a number of overlayers deposited on the surface of a waveguide propagating a wave in accordance with a given propagation mode, the overlayer of order m starting from the axis is of width 1m= 2ROOT (m+1) lambda f - 2ROOT m lambda f and is at the distance from the axis rm= 2ROOT m lambda f in which f is the focal distance of the lens, lambda the wavelength of the light in the guide and m a parameter successively assuming the different values of the natural sequence of integers from 1 to p+1, wherein the thickness and/or the length of each film is at least equal to the penetration of absorption distance of the wave guided in or beneath the overlayer for the adopted propagation mode.