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14 July 2003 Photoinduced spontaneous patterning of azopolymer films using light-controlled mass transport
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Proceedings Volume 4991, Organic Photonic Materials and Devices V; (2003)
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States
During the last decade, large effort has been dedicated towards the miniaturization of devices for photonic applications. One of the key points towards this objective is structurization at the nanoscale level. Recently, one-step photoinscription of surface relief gratings onto azo-polymers was demonstrated: when a polymer film containing azobenzene dyes is irradiated by an interference pattern between polarizaed laser beams at a wavelength near the chromophore absorption band, the film surface undergoes a direct, reversible and controlled topographic modification. Grating modulation amplitudes as large as the film thickness can be obtained. In this work we provide experimental evidence of a new spontaneous light-assisted submicrometer hexagonal patterning process. More particularly, we show that uniform irradaiton of an azo-dye polymer using a singel laser beam wtih normal incidence onto the polymer film surface leads to a self structurization process resulting in the formation of a quasi hexagonal grating. The influence of parameters such as the laser intensity, the irradiation time, the thickness of the polymer film but also the irradiation wavelength is studied towards a better understanding of the process. Full control of the mechanisms at the origin of such process could further permit a complete manipulation of the molecular order and thus enable the generation of other spontaneous complex structures opening the way to the development of new easy-to-set micro and nano-structuration technqiues.
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Christophe Hubert, Celine Fiorini-Debuisschert, Paul Raimond, and Jean-Michel Nunzi "Photoinduced spontaneous patterning of azopolymer films using light-controlled mass transport", Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003);

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