SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster II
MM 23.19: Poster
Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2
Orientation-tunable Rod-shaped Liquid Crystal Under Surface Acoustic Wave — •Zhuoqing Li1, Pai Zhao1, Patrick Huber2, and Robert Blick2 — 1TU Hamburg Institut für Material- und Röntgenphysik, Hamburg, Germany — 2Center for Hybrid Nanostructures, University of Hamburg, Hamburg, Germany
Surface acoustic waves (SAW) are widely used in both industry and science, while liquid crystals are unique fluids exhibiting long-rang order and self-organization. In this work, a combination of SAW and rod-shaped nematic liquid crystals will be studied to explore the tunablility of liquid crystal orientations under SAW. Surface acoustic waves are introduced into miniatured solid-state devices on piezoelectric LiNbO3 substrates by interlocking metallic gates called interdigitated transducers (IDT). When a high-frequency sinusoidal signal is applied to the IDT, a mechanical deformation wave will propagate along the surface of the substrate and the induced shear strain will influence the orientation of the nematic liquid crystals on the surface of the substrate. A feature of the nematic phase is that the anisotropic rod-shaped molecules are collectively orientated in preferred directions. Considering the optical anisotropy of rod-shaped liquid crystals, the collective orientation change of liquid crystal molecules under SAW can be analyzed through birefringence measurements. By studying the tunability of the liquid crystal orientation under SAW induced shear component of the wave, we will be able to develop a novel wireless LC-based optical modulator controllable by acoustic stimuli.