Ion-beam treated polyimide surface studied by second-harmonic generation

초록

Optical second-harmonic generation (SHG) was used to investigate the molecular orientation and structure of ion-beam treated polyimide surface and the adsorbed liquid crystal monolayer on this surface. The SHG signal from the polyimide surface exposed obliquely to a directional ion beam was almost isotropic azimuthally, while that from the rubbed polyimide surface showed expected anisotropy with respect to the rubbing direction. SHG from the monolayer of liquidcrystal molecules adsorbed on top of the ion-beam-treated polyimide surface became slightly more anisotropic, as compared to the polyimide surface.

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