Polymer segmental alignment in polarized pulsed laser-induced periodic surface structures

1997 
Polarized pulsed laser-induced periodic surface structures (LIPSS) of sub-quarter-micron size in a large area have been formed on polyimides, poly(ethylene terephthalate), and other polymer films using the fourth harmonic Nd:YAG laser [1,2] and Ar-F excimer laser irradiation [3, 4]. These LIPSS patterns were formed by repeated heating and cooling in polymer surfaces following intensity distribution caused by interference of reflected surface electromagnetic waves and incoming polarized laser beam [5,6]. Because the polarized laser pulses have a directional electric field, polymer functional groups align themselves along the electric field during the period of LIPSS formation. The dichroism due to functional group alignments has been studied with polarized reflected FT-IR spectroscopy.
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