Patent ID: 6998195
Filing Date: 2006-02-14
Classification: G01B,G03H

Abstract:
1. A method for forming optical holograms on an amorphous molecular semiconductor (AMS) film deposited on a transparent conducting sub-layer comprising: charging a surface of the AMS-film by a corona discharge up to a potential before local breakdowns begin to occur; reducing the electron and hole components of the dark conductivity of the AMS-film by pulse heating the AMS-film when it has reached the operating surface potential; initiating heating of the AMS-film for developing the electrostatic image into a geometrical relief at a start temperature and heating the AMS-film at a heating rate; creating a latent electrostatic image of a desired holographic image of an object on the surface of the AMS-film; and developing the latent electrostatic image into a geometrical relief at the surface of the AMS-film, wherein the AMS-film comprises about 92 wt % of a copolymer comprising N-epoxypropylcarbazole and about 5 wt % butylglycidyl ether, doped with about 5 wt % of methyl-9-(4-dodecyl-oxyphenyl-1,3-selenathiol-2-ylidene)-2,5,7-trinitrofluorene-4-carboxylate and about 4 wt % of hexadecyl-2,7-dinitro-dicyanomethylenfluorene-4-carboxylate.