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Direct fabrication of periodic patterns with hierarchical sub-wavelength structures on poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) thin films using femtosecond laser interference patterning

 
: Lasagni, A.F.; Shao, P.; Hendricks, J.; Shaw, C.M.; Martin, D.C.; Das, S.

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Applied surface science 256 (2010), No.6, pp.1708-1713
ISSN: 0169-4332
English
Journal Article
Fraunhofer IWS ()

Abstract
A simple optical interference method for the fabrication of simply periodic and periodic with a substructure on poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) using femtosecond laser interference patterns is demonstrated. The femtosecond laser pulse was split by a diffractive beam splitter and overlapped with two lenses. Homogeneous periodic arrays could be fabricated even using a single laser pulse. In addn., multipulse irradn. resulted in reproducible sub-wavelength ripples oriented perpendicularly to the laser polarization with spatial period from 170 to 220 nm (around one-fourth of the laser wavelength). In addn., the obsd. size of the spatial period was not affected by the no. of incident laser pulses or accumulated energy d. Using high energy pulses it was possible to completely remove the PEDOT:PSS layer without inducing damage to the underneath substrate. [on SciFinder(R)]

: http://publica.fraunhofer.de/documents/N-139349.html