الفهرس 
Introduction
Coupling of beams to planar guidesOnly 14 pages are availabe for public view
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Abstract
This work is split into two main areas of study. The first is preparing some thin films made of photoactive polymer (polycarbonate PC films doped with 7 % wt of DSRl). Also the thickness and the refractive index of these films are measured as well. In the second area, we made a theoretical studies (depend on the data obtained from the first part) of optical switching based on a photoactive polymers. These theoretical studies split into two parts. The first is studying an optical switch consists of two slab waveguides one of them made of a photoactive polymer. We found that for synchronous slabs there are always two solutions of the compound mode problem. These two modes of the compound structure would have even and odd symmetry if both slabs were identical. However, even for non-identical synchronous slabs the two modes can be superimposed so that at the input end of the switch their fields nearly cancel in one slab while they reinforce each other in the opposite slab. Since both modes have slightly different propagation constants B1 and B2 , their relative phases will reverse at a distance: