JBO Letters

Energy enhancement in time-reversed ultrasonically encoded optical focusing using a photorefractive polymer

[+] Author Affiliations
Yuta Suzuki, Xiao Xu, Puxiang Lai, Lihong V. Wang

Washington University in St. Louis, Optical Imaging Laboratory, Department of Biomedical Engineering, St. Louis, Missouri 63130

J. Biomed. Opt. 17(8), 080507 (Aug 14, 2012). doi:10.1117/1.JBO.17.8.080507
History: Received May 31, 2012; Revised July 19, 2012; Accepted July 24, 2012
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Abstract.  Time-reversed ultrasonically encoded (TRUE) optical focusing achieves light focusing into scattering media beyond one transport mean free path, which is desirable in biomedical optics. However, the focused optical energy needs to be increased for broad applications. Here, we report the use of a photorefractive polymer (PRP) as the phase conjugate mirror in TRUE optical focusing. The PRP boosted the focused optical energy by 40 times in comparison to the previously used photorefractive Bi12SiO20 crystal. As a result, we successfully imaged absorbing objects embedded in the middle plane of a tissue-mimicking phantom having an optical thickness of 120 scattering mean free paths.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Yuta Suzuki ; Xiao Xu ; Puxiang Lai and Lihong V. Wang
"Energy enhancement in time-reversed ultrasonically encoded optical focusing using a photorefractive polymer", J. Biomed. Opt. 17(8), 080507 (Aug 14, 2012). ; http://dx.doi.org/10.1117/1.JBO.17.8.080507


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