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[2015.11.26] [SIC Colloquium] 11/26(Thu) 16:00, Biophotonics beyond multiple light scattering, Prof. Wonshik Choi, Language: English
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작성일15-11-26 11:54 조회수1984
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Dear SIC students,

It is my pleasure to announce the SIC Colloquium by Dr.Wonshik Choi, who is currently with the Korea University.

For detailed information, please see the following:

 

SIC Colloquium

Host: Byong Seung Ham / Language: English

Thursday, November 26, 2015, 16:00-17:30, Haerim Hall, SIC-B Bldg. 1st Floor

Biophotonics beyond multiple light scattering

Wonshik Choi, PhD

Department of Physics, Korea University

 

Abstract

Multiple light scattering occurring in a scattering medium obstructs imaging targets embedded in the medium and attenuates wave energy delivered to the targets. In this talk, I will introduce experimental methods that either make use of or get away with the multiple-scattered waves for performing optical imaging and enhancing light energy delivery in scattering media. For the former, we measured a transmission/reflection matrix of a scattering medium and used it to convert the medium as a unique lens. An example includes an endoscopic imaging by a single strand of multimode fiber, a special case of the scattering media. We also coupled light to the so-called eigenchannels of the medium identified from the measured matrix, some of which have extraordinary transmittance.

For the latter, I will introduce a novel method to rule out multiple-scattered waves. In this approach, we used both a time-gated detection and a spatial input-output correlation to preferentially accumulate single-scattered waves retaining object information over multiple scattering backgrounds. In doing so we achieved imaging depth of 11.5 times the scattering mean free path with near-diffraction-limit resolution of 1.0 μm.  These studies altogether will lead to great important applications in deep-tissue optical bio-imaging and disease treatments.

References

1.    Overcoming the diffraction limit using multiple light scattering in a highly disordered medium, Youngwoon Choi, Taeseok Daniel Yang, Christopher Fang-Yen, Pilsung Kang, Kyoung Jin Lee, Ramachandra R. Dasari, Michael S. Feld, and Wonshik Choi, Physical Review Letters 107, 023902 (2011)

2.    Scanner-free and wide-field endoscopic imaging by using a single multimode optical fiber, Youngwoon Choi, Changhyeong Yoon, Moonseok Kim, Taeseok Daniel Yang, Christopher Fang-Yen, Ramachandra R. Dasari, Kyoung Jin Lee, and Wonshik Choi, Physical Review Letters 109, 203901 (2012)

3.    Maximal energy transport through disordered media with the implementation of transmission eigenchannels, Moonseok Kim, Youngwoon Choi, Changhyeong Yoon, Wonjun Choi, Jaisoon Kim, Q-Han Park and Wonshik Choi, Nature Photonics 6, 581 (2012)

4.    Measurement of the time-resolved reflection matrix for enhancing light energy delivery into a scattering medium, Youngwoon Choi, Timothy R. Hillman, Wonjun Choi, Niyom Lue, Ramachandra R. Dasari, Peter T. C. So, Wonshik Choi, and Zahid Yaqoob, Physical Review Letters 111, 243901 (2013)

5.    Imaing deep within a scattering medium using collective accumulation of single-scattered waves, Sungsam Kang, Seungwon Jeong, Wonjun Choi, Hakseok Ko, Taeseok D. Yang, Jang Ho Joo, Jae-Seung Lee, Yong-Sik Lim, Q-Han Park and Wonshik Choi, Nature Photonics 9, 253 (2015)

 

Regards,


다음글  [2015.12.03] [SIC Colloquium] 12/3(Thu) 16:00, THz interaction with biomolecules , Prof. Gun-Sik Park, Language: English
이전글  [2015.11.20] [SIC Seminar] 11/26(Thu) 14:00, #203, SIC-B Bldg., Revisiting mRNA tailing by 3′-terminome sequencing, Dr.Hyeshik Chang, Language: English

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