Abstract
A remarkable enhancement was observed in the second-harmonic generation (SHG) from the helicoidal structure of a ferroelectric smectic C* liquid crystal, when two counter-propagating fundamental waves generate SH light with the same wavelength as the optical pitch of the helicoid. This enhanced signal based on a helicoidal distributed feedback action is proportional to the fourth power of the sample thickness in thick cells, and becomes larger compared with the conventional phase-matched SHG signal in relatively thick samples, i.e., 100 µm.
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