Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing
Patent
1990-01-26
1991-07-02
Healy, Brian
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Physical developing
350 9613, 350 9614, 350 9634, 350320, 430170, 430176, 307427, 307428, 307430, G02B 610, G03C 152, H03F 700
Patent
active
050281097
ABSTRACT:
A method of fabricating a periodic nonlinear optic radiation modulation zone within a polymeric waveguide structure. The method includes the steps of (a) providing a layer of a polymeric material having an optically active material that is orientable by an electrical field; (b) applying an electrical field to the layer for orienting at least a portion of the optically active material; and (c) photopolymerizing at least a portion of the polymeric layer for fixing the oriented optically active material into the oriented position. In accordance with one embodiment the step of photopolymerizing includes the steps of (d) generating a diffraction pattern within the polymeric layer, the diffraction pattern being characterized by bright and dark fringes; and (e) photoplymerizing a volume of the polymeric layer within substantially only portions thereof that correspond to the bright fringes. In accordance with another embodiment the step of applying includes a step of generating a periodic DC field potential within the polymeric layer by a third order effect induced by passing radiation having a wavelength of lambda and a wavelength of 2(lambda) through the polymeric layer.
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