Abstract
Linear dichroism – the in-plane optical anisotropy – is observed for organic thin films grown on fused silica and glass substrates. The films made of [4-pyrid-4-yl-ethynyl-benzoic acid] and [4-trans-2-(pyrid-4-yl-vinyl) benzoic acid] are deposited from an angle of about 30° with respect to the surface normal under ultra-high vacuum conditions. The film thickness measurements by alpha-step, atomic force microscopy in tapping mode, and in situ ellipsometry as well as transmission spectra are discussed in detail. Moreover, the optical constants of these novel materials are determined using ellipsometry and transmission spectroscopy. The remarkable optical asymmetry is found in the ultra-violet transmission spectra and attributed to oriented molecules which are connected by hydrogen bonds.
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