[융합과학부]Super-depth optical imaging inside scattering media

Speaker: 최원식 교수(고려대학교)

Date & Time: 2019년 5월 1일(수), 17:00

Where: 융합대학원 D-122호

Abstract

Multiple light scattering occurring in scattering media such as biological tissues hinders imaging objects embedded inside the medium and attenuates wave energy delivered to the targets. In this talk, I will introduce experimental methods to improve the working depth of high-resolution optical imaging in scattering media. In our proposed methods, we exploited both time-gated detection and spatial input-output correlation for identifying and eliminating sample-induced aberrations even in the presence of strong multiple light scattering [1, 2]. In doing so, we enhanced Strehl ratio by about 1,000 times, two orders of magnitude improvement over conventional adaptive optics, and demonstrated a spatial resolution of 600 nm up to the unprecedented imaging depth of 7 scattering mean free paths. We also developed methods to control time-gated multiple light scattering for efficiently delivering light energy to deeply embedded targets inside scattering media. For targets that are too deep to be visible by optical imaging, we demonstrated a more than 10-fold enhancement in light energy delivery in comparison with ordinary wave diffusion cases [3, 4]. We expect that all these studies will lead to advances in deep-tissue optical bio-imaging, bio-sensing, and light therapy.

References
1. S. Kang et al., High-resolution adaptive optical imaging within thick scattering media using closed-loop accumulation of single scattering, Nature Communications 8, 2157 (2017)
2. S. Kang et al., Imaging deep within a scattering medium using collective accumulation of single-scattered waves, Nature Photonics 9, 253 (2015)
3. S. Jeong et al., Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering, Nature Photonics 12, 277 (2018)
4. M. Kim et al., Maximal energy transport through disordered media with the implementation of transmission eigenchannels, Nature Photonics 6, 581 (2012)

Biography

[학력]

Ph.D., Seoul National University, Seoul, Korea, Atomic and laser physics, 2004
M.S., Seoul National University, Seoul, Korea, Physics, 1999
B.S., Seoul National University, Seoul, Korea, Physics, 1997

[경력]

July 2016 – present Associate Director, Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science, Korea
Sep. 2017 – present Associate Professor, Department of Physics, Korea University, Seoul Korea
Sep. 2012 – Aug. 2017 Associate Professor, Department of Physics, Korea University, Seoul Korea
Sep. 2009 – Aug. 2012 Assistant Professor, Department of Physics, Korea University, Seoul Korea

 

초청자 : 융합과학부 나노융합전공 송윤규 교수(연락처 : 031-888-9133, songyk@snu.ac.kr )

2019-04-25|