Patent ID: 7978386

Claim:
A computer implemented method of generating a holographic diffraction pattern, the computer implemented method comprising the steps of: (i) defining at least one three-dimensional geometrical shape; (ii) generating at least one rectangular line segment of predetermined width and length to represent the at least one geometrical shape; (iii) calculating, using a computer, a diffraction pattern of the at least one rectangular line segment on a hologram plane, including calculating a Fresnel diffraction equation for the at least one rectangular line segment with a line width control term and a line length control term; and (iv) adding vectorially, where there are two or more rectangular line segments, the diffraction patterns to form the holographic diffraction pattern; the method being characterized in that: said line width control term and said line length control term are functions of a distance between the rectangular line segment and the hologram plane, said distance being along an optical axis of the hologram plane.