4 March 2013 High-efficiency time-reversed ultrasonically encoded optical focusing using a large-area photorefractive polymer
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Abstract
Time-reversed ultrasonically encoded (TRUE) optical focusing focuses light beyond one transport mean free path by phase-conjugating the ultrasonically tagged light. However, in previous works, only a small portion of the tagged light was phase-conjugated by using a photorefractive Bi12SiO20 crystal, due to its small active area (1x1 cm2). In this work, we report high-efficiency TRUE focusing using a large-area photorefractive polymer (5x5 cm2), which demonstrated ~40 times increase in focused energy. Further, we imaged absorbers embedded in a turbid sample of thickness of ~12 transport mean free paths.
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Yuta Suzuki, Yuta Suzuki, Puxiang Lai, Puxiang Lai, Xiao Xu, Xiao Xu, Lihong V. Wang, Lihong V. Wang, } "High-efficiency time-reversed ultrasonically encoded optical focusing using a large-area photorefractive polymer", Proc. SPIE 8581, Photons Plus Ultrasound: Imaging and Sensing 2013, 85811G (4 March 2013); doi: 10.1117/12.2005021; https://doi.org/10.1117/12.2005021
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