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Single-step Photo fabrication of Kinoforms in use of Azobenzene-containing Polymer Films

Published online by Cambridge University Press:  11 February 2011

Shin Yasuda ,
Jiro Minabe ,
Katsunori Kawano ,
Tatsuya Maruyama  and
Hidenori Yamada
Shin Yasuda
Affiliation:
Corporate Research Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakai-machi, Ashigarakami-gun, Kanagawa 259–0157, Japan
Jiro Minabe
Affiliation:
Corporate Research Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakai-machi, Ashigarakami-gun, Kanagawa 259–0157, Japan
Katsunori Kawano
Affiliation:
Corporate Research Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakai-machi, Ashigarakami-gun, Kanagawa 259–0157, Japan
Tatsuya Maruyama
Affiliation:
Corporate Research Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakai-machi, Ashigarakami-gun, Kanagawa 259–0157, Japan
Hidenori Yamada
Affiliation:
New Business Center, Fuji Xerox Company, Ltd., 430 Sakai, Nakai-machi, Ashigarakami-gun, Kanagawa 259–0157, Japan
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Abstract

We propose a new method of optically fabricating kinoforms using polyester containing cyanoazobenzene units in the side chain. This method utilizes the surface relief structures induced optically on the azopolymer films. Using a gray-tone amplitude mask with black and white lines as a spatial light modulator, we constructed the surface relief structures on the azopolymer films with an argon-ion laser beam (488nm). The relief depths constructed were deep enough to provide a wide range of visible light with a phase difference of 2π. In addition, irradiation on the azopolymer film with a spatially modulated light that had multilevel intensities inscribed the multilevel relief structure reflecting the intensity modulation. This property is applicable to the fabrication of diffractive optical elements, especially kinoforms, because the multilevel relief structure provides an incident light with phase modulation. We designed a phase pattern for a kinoform by computation and expressed it as a gray-tone amplitude mask. Irradiation on the film through the gray-tone mask with the pump beam inscribed a multilevel relief structure that diffracted an incident light to produce a desired image. The desired image appeared without the effect of the internal refractive index modulation of the film. We, therefore, confirmed a possibility of fabricating a kinoform with a multilevel relief structure on the azopolymer film. Since our fabrication method for kinoforms requires only exposure, it has a significant advantage over other techniques that require additional processes such as developing and etching.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 734: Symposia A/B – Defect-Mediated Phenomena in Ordered Polymers – Polymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers , 2002 , B9.50
Copyright
Copyright © Materials Research Society 2003

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