1. Frequency-swept time-reversed ultrasonically encoded optical focusing.
- Author
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Yuta Suzuki and Wang, Lihong V.
- Subjects
- *
BIOMEDICAL engineering , *WAVEFRONTS (Optics) , *ULTRASONIC imaging , *OPTICAL properties , *FLUORESCENCE - Abstract
A technique to rapidly scan an optical focus inside a turbid medium is attractive for various biomedical applications. Time-reversed ultrasonically encoded (TRUE) optical focusing has previously demonstrated light focusing into a turbid medium, using both analog and digital devices. Although the digital implementation can generate a focus with high energy, it has been time consuming to scan the TRUE focus inside a sample. Here, by sweeping the frequencies of both ultrasound and light, we demonstrate a multiplex recording of ultrasonically encoded wavefronts, accelerating the generation of multiple TRUE foci. Using this technique, we obtained a 2-D image of a fluorescent target centered inside a turbid sample having a thickness of 2.4 transport mean free paths. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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