作者
Qiang Yang, Xiao Xu, Puxiang Lai, Daxiong Xu, Lihong V Wang
发表日期
2013/11/1
期刊
Journal of biomedical optics
卷号
18
期号
11
页码范围
110502-110502
出版商
Society of Photo-Optical Instrumentation Engineers
简介
Focusing light inside highly scattering media is a challenging task in biomedical optical imaging, manipulation, and therapy. A recent invention has overcome this challenge by time reversing ultrasonically encoded diffuse light to an ultrasound-modulated volume inside a turbid medium. In this technique, a photorefractive (PR) crystal or polymer can be used as the phase conjugate mirror for optical time reversal. Accordingly, a relatively long ultrasound burst, whose duration matches the PR response time of the PR material, is usually used to encode the diffuse light. This long burst results in poor focusing resolution along the acoustic axis. In this work, we propose to use two intersecting ultrasound beams, emitted from two ultrasonic transducers at different frequencies, to modulate the diffuse light at the beat frequency within the intersection volume. We show that the time reversal of the light encoded at the beat frequency …
学术搜索中的文章
Q Yang, X Xu, P Lai, D Xu, LV Wang - Journal of biomedical optics, 2013