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Paper Abstract and Keywords
Presentation 2024-06-28 10:25
Effects of a square-wave voltage drive on ultrasonic liquid crystal optical lenses
Ryoya Mizuno, Yuma Kuroda (Doshisha Univ.), Akira Emoto (Tokushima Univ), Mami Matsukawa, Daisuke Koyama (Doshisha Univ.) US2024-7
Abstract (in Japanese) (See Japanese page) 
(in English) Conventional optical lenses only have one focal point, and compound lens systems that have multiple lenses and mechanical actuators are used in lens modules to focus objects at near to far distances although the camera modules with these systems tend to be bulky and have a low time response. Electrically-controllable varifocal lenses will accelerate the development of compact-size photographic devices with a high-speed response. We developed ultrasound varifocal liquid crystal lenses, that consist of a liquid crystal layer between two glass discs and an ultrasound transducer, where the orientation of nematic liquid crystal molecules can be controlled by the acoustic radiation force. The lenses can change the refractive index distribution and its focal length by ultrasound vibration by utilizing both high liquidity and optical anisotropy of the nematic liquid crystal molecules. In this report, we fabricated ultrasonic liquid crystal lenses and applied sinusoidal and square waves of the resonant frequency to the lenses to investigate the effects of the input waveform on their optical characteristics. It was found that the optical characteristics exhibited by the cases with the sinusoidal- and square-wave drives were largely similar, although slight differences were observed in the vibrational distributions on the lens substrate, suggesting that the lens can be controlled by a square-wave drive.
Keyword (in Japanese) (See Japanese page) 
(in English) Ultrasound / Variable Focus Optical Lens / NematicLiquid Crystal / Acoustic Radiation Force / Square wave / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 91, US2024-7, pp. 6-10, June 2024.
Paper # US2024-7 
Date of Issue 2024-06-21 (US) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF US2024-7

Conference Information
Committee US  
Conference Date 2024-06-28 - 2024-06-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Shiinoki Cultural Complex, Ishikawa Prefecture 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Ultrasound in medicine, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2024-06-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effects of a square-wave voltage drive on ultrasonic liquid crystal optical lenses 
Sub Title (in English)  
Keyword(1) Ultrasound  
Keyword(2) Variable Focus Optical Lens  
Keyword(3) NematicLiquid Crystal  
Keyword(4) Acoustic Radiation Force  
Keyword(5) Square wave  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ryoya Mizuno  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Yuma Kuroda  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Akira Emoto  
3rd Author's Affiliation Tokushima University (Tokushima Univ)
4th Author's Name Mami Matsukawa  
4th Author's Affiliation Doshisha University (Doshisha Univ.)
5th Author's Name Daisuke Koyama  
5th Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2024-06-28 10:25:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2024-7 
Volume (vol) vol.124 
Number (no) no.91 
Page pp.6-10 
#Pages 5 
Date of Issue 2024-06-21 (US) 

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