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3 March 2014 Digital reflection-mode time-reversed ultrasonically encoded (TRUE) optical focusing
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To achieve localized light delivery beyond turbid layers, TRUE optical focusing has been previously implemented by both analog and digital devices. The digital scheme offers a higher energy gain than the analog version. In many biological applications, the reflection-mode configuration, which uses backscattered light from the sample, is more suitable than the transmission-mode configuration. Although reflection-mode analog TRUE focusing has been demonstrated, its digital implementation has not been explored. Here, we report a reflection-mode digital TRUE focusing to concentrate light through a turbid layer. Further, by simply moving the ultrasound focus, we show the system's dynamic focusing capability.
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Yuta Suzuki, Jian Wei Tay, Qiang Yang, and Lihong Wang "Digital reflection-mode time-reversed ultrasonically encoded (TRUE) optical focusing", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89431B (3 March 2014);

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