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Related Experiment Video

Updated: Jun 22, 2025

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
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Ultrasonic liquid crystal tunable light diffuser.

Yuma Kuroda1, Ryoya Mizuno1, Daisuke Koyama2

  • 1Faculty of Science and Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe, Kyoto, 610-0321, Japan.

Scientific Reports
|July 4, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an electrically tunable light diffuser using ultrasound and liquid crystals (LC). The device offers controllable and rotatable light diffusion without mechanical parts, enhancing optical directivity.

Keywords:
Light diffuserLiquid crystalOptical deviceUltrasoundVibration mode

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Acoustics

Background:

  • Conventional light diffusers lack controllable optical directivity.
  • Existing diffusers utilize static structures like periodic profiles or colloid-filled layers.

Purpose of the Study:

  • To propose and demonstrate an electrically tunable light diffuser.
  • To achieve controllable and rotatable light diffusion using ultrasound in liquid crystals.

Main Methods:

  • An ultrasonic liquid crystal (LC) diffuser was fabricated with an LC layer between glass discs and an ultrasonic transducer.
  • A resonant non-coaxial flexural vibration mode was induced via electrical signals to the transducer's electrodes.
  • Acoustic radiation force altered LC molecular orientation and light distribution.

Main Results:

  • The diffusion angle of transmitted light was voltage-dependent, maximizing at 16.0 V.
  • Vibrational distribution and diffusion directivity were rotatable by adjusting input voltages.
  • The diffuser demonstrated tunable light-diffusing functionality without moving mechanical parts.

Conclusions:

  • An ultrasonic LC diffuser offers tunable and rotatable light diffusion.
  • This technology provides a novel approach to controlling optical directivity in thin-film devices.
  • The proposed method avoids mechanical components, leading to robust and versatile light diffusion applications.