[17p-A32-1~13] 3.1 Basic optics and frontier of optics

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)English Presentation

[17p-A32-6] Evaluation of a cholesteric liquid crystal cell controlled via ultrasound

〇Jessica Onaka¹, Yuna Kim¹, Daisuke Koyama², Yukitoshi Otani¹ (1.CORE, Utsunomiya Univ., 2.Doshisha Univ.)

Keywords:

optical devices,cholesteric liquid crystal

Liquid crystal (LC) materials offer dynamic optical properties as their refractive index can be modulated by external stimuli. This capability enables the development of adaptive optical devices that can change focal lengths and generate various polarization states. Such devices promise a versatility beyond that of conventional optics. Specifically, in polarization control, we aim to manipulate parameters like birefringence phase difference, optical rotation, dichroism, and helical twisting power. In this work, we evaluate the effects of ultrasound on a cholesteric liquid crystal material using an annular piezoelectric ceramic. This ceramic uses ultrasound to drive a liquid-crystal layer sandwiched between two circular glass substrates. The piezoelectric ceramic is divided into four quadrants, each independently driven with sinusoidal voltages at the resonant frequency of the lens. Various combinations of the four-channel transducer allow us to observe the optical properties of the cholesteric liquid-crystal cell under ultrasound excitation.