Optically driven liquid crystal rotator

Keita Saito; Yasuyuki Kimura

doi:10.1117/12.2658782

8 December 2022 Optically driven liquid crystal rotator

Keita Saito, Yasuyuki Kimura

Proceedings Volume 12479, Optical Manipulation and Structured Materials Conference (OMC 2022); 1247908 (2022) https://doi.org/10.1117/12.2658782
Event: Optics and Photonics International Congress, 2022, Yokohama, Japan

Abstract

Rotation of nematic liquid crystal (NLC) droplets by irradiation of focused circular polarized light is experimentally studied. Optical torque transferred to a droplet depends on its size. We discuss the relation between the LC molecular alignment inside the droplet and its rotation mechanism. In a larger droplet, the internal LC alignment is bipolar and wave-plate behavior becomes dominant. In a smaller droplet, the optical anisotropy reduces with decrease of its size and scattering process mainly contributes its rotation. We also construct multiple LC rotators system using a holographic optical tweezer. Such optically controllable vortex enables us to realize complex flow field at micron-scale.

Citation Download Citation

Keita Saito and Yasuyuki Kimura "Optically driven liquid crystal rotator", Proc. SPIE 12479, Optical Manipulation and Structured Materials Conference (OMC 2022), 1247908 (8 December 2022); https://doi.org/10.1117/12.2658782

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