Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing

Takeo Sasaki; Takaaki Yagami; Toshinobu Takashi; Kaita Suzuki; Gouta Ikeda; Yukihiro Ishii; Khoa V. Le; Yumiko Naka

doi:10.1117/12.2633374

3 October 2022 Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing

Takeo Sasaki, Takaaki Yagami, Toshinobu Takashi, Kaita Suzuki, Gouta Ikeda, Yukihiro Ishii, Khoa V. Le, Yumiko Naka

Author Affiliations +

Proceedings Volume 12207, Liquid Crystals XXVI; 1220702 (2022) https://doi.org/10.1117/12.2633374
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Abstract

The photorefractive effect of flexoelectric smectic liquid crystal mixtures was investigated and applied to a laser ultrasonic measurement. Smectic liquid crystal mixtures, composed of smectic-C liquid crystals, photoconductive chiral compounds, and a sensitizer, are known to exhibit a fast photorefractive effect. The principle of the ultrasonic measurement is that a nanosecond laser pulse is shot on an object to cause an ultrasonic vibration, a continuous laser beam is irradiated on the object, and the ultrasonic variation is detected using photorefractive two-beam coupling. This method can be used to investigate the thickness and the internal structure of an object without contact.

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Citation Download Citation

Takeo Sasaki, Takaaki Yagami, Toshinobu Takashi, Kaita Suzuki, Gouta Ikeda, Yukihiro Ishii, Khoa V. Le, and Yumiko Naka "Photorefractive effect of smectic liquid crystals and their application to laser ultrasonic remote sensing", Proc. SPIE 12207, Liquid Crystals XXVI, 1220702 (3 October 2022); https://doi.org/10.1117/12.2633374

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