Preferential coupling of an incident wave to reflection eigenchannels of disordered media

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Title
Preferential coupling of an incident wave to reflection eigenchannels of disordered media
Author(s)
Wonjun Choi; Moonseok Kim; Donggyu Kim; Changhyeong Yoon; Christopher Fang-Yen; Q-Han Park; Wonshik Choi
Publication Date
2015-06
Journal
SCIENTIFIC REPORTS, v.5, no., pp.10393 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Light waves incident to a highly scattering medium are incapable of penetrating deep into the medium due to the multiple scattering process. This poses a fundamental limitation to optically imaging, sensing, and manipulating targets embedded in opaque scattering layers such as biological tissues. One strategy for mitigating the shallow wave penetration is to exploit eigenchannels with anomalously high transmittance existing in any scattering medium. However, finding such eigenchannels has been a challenging task due to the complexity of disordered media. Moreover, it is even more difficult to identify those eigenchannels from the practically relevant reflection geometry of measurements. In this Letter, we present an iterative wavefront control method that either minimizes or maximizes the total intensity of the reflected waves. We proved that this process led to the preferential coupling of incident wave to either low or high-reflection eigenchannels, and observed either enhanced or reduced wave transmission as a consequence. Since our approach is free from prior characterization measurements such as the recording of transmission matrix, and also able to keep up with sample perturbation, it is readily applicable to in vivo applications. Enhancing light penetration will help improving the working depth of optical sensing and treatment techniques.
URI
https://pr.ibs.re.kr/handle/8788114/2016
ISSN
2045-2322
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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