Focusing light through biological tissue and tissue-mimicking phantoms up to 9.6 cm in thickness with digital optical phase conjugation

Yuecheng Shen; Yan Liu; Cheng Ma; Lihong V. Wang

doi:10.1117/1.JBO.21.8.085001

12 August 2016 Focusing light through biological tissue and tissue-mimicking phantoms up to 9.6 cm in thickness with digital optical phase conjugation

Yuecheng Shen, Yan Liu, Cheng Ma, Lihong V. Wang

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Journal of Biomedical Optics, Vol. 21, Issue 8, 085001 (August 2016). https://doi.org/10.1117/1.JBO.21.8.085001

Abstract

Optical phase conjugation (OPC)-based wavefront shaping techniques focus light through or within scattering media, which is critically important for deep-tissue optical imaging, manipulation, and therapy. However, to date, the sample thickness in OPC experiments has been limited to only a few millimeters. Here, by using a laser with a long coherence length and an optimized digital OPC system that can safely deliver more light power, we focused 532-nm light through tissue-mimicking phantoms up to 9.6 cm thick, as well as through ex vivo chicken breast tissue up to 2.5 cm thick. Our results demonstrate that OPC can be achieved even when photons have experienced on average 1000 scattering events. The demonstrated penetration of nearly 10 cm (∼100 transport mean free paths) has never been achieved before by any optical focusing technique, and it shows the promise of OPC for deep-tissue noninvasive optical imaging, manipulation, and therapy.

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Yuecheng Shen, Yan Liu, Cheng Ma, and Lihong V. Wang "Focusing light through biological tissue and tissue-mimicking phantoms up to 9.6 cm in thickness with digital optical phase conjugation," Journal of Biomedical Optics 21(8), 085001 (12 August 2016). https://doi.org/10.1117/1.JBO.21.8.085001

Published: 12 August 2016

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