標題: | Acousto-optical effect induced by ultrasound pulses in a nematic liquid-crystal film |
作者: | Lee, W Chen, SH 光電工程學系 Department of Photonics |
公開日期: | 1-四月-2001 |
摘要: | The reorientation of the director of a homeotropically aligned nematic liquid-crystal film subjected to ultrasound pulses is discussed. The relationship is investigated for the first time, to our knowledge, between the transmitted optical power and the high-frequency (approximately megahertz) pulsed ultrasound intensity. It is evident that there exists a power law governing the ultrasound-intensity-dependent optical transmission. However, the data indicate no existence of a characteristic threshold for the acousto-optical effect. Our results suggest that acoustic streaming, known to be responsible for acousto-optical effects in cw ultrasound experiments, should also play a similarly important role in the case involving a pulsed ultrasound field. (C) 2001 Optical Society of America. |
URI: | http://hdl.handle.net/11536/29719 |
ISSN: | 0003-6935 |
期刊: | APPLIED OPTICS |
Volume: | 40 |
Issue: | 10 |
起始頁: | 1682 |
結束頁: | 1685 |
顯示於類別: | 期刊論文 |