abstract:

  ¡°Turbidity¡± caused by multiple light scattering interrupts the propagation of waves, and thus undermines optical imaging. For example, translucent biological tissues exhibiting optical turbidity have posed limitations on the imaging depth and energy transmission. In this talk, I will describe the counterintuitive finding that optical turbidity, rather than being a hindrance to imaging, can in fact dramatically improve both the spatial resolution and the field of view of the target images. I will close my talk by introducing our recent experimental work that demonstrated the significant enhancement of light energy delivery through a highly turbid medium. This seemingly implausible task was made possible by coupling light into the resonance modes, called transmission eigenchannels, of the medium. These studies will all together lead to great important applications in deep-tissue optical bio-imaging and disease treatment.

References
1. Youngwoon Choi, Taeseok Daniel Yang, Christopher Fang-Yen, Pilsung Kang, Kyoung Jin Lee, Ramachandra R. Dasari, Michael S. Feld, and Wonshik Choi, ¡°Overcoming the diffraction limit using multiple light scattering in a highly disordered medium,¡± Physical Review Letters, 107 023902 (2011)
2. Youngwoon Choi, Changhyeong Yoon, Moonseok Kim, Taeseok Daniel Yang, Christopher Fang-Yen, Ramachandra R. Dasari, Kyoung Jin Lee, and Wonshik Choi, ¡°Scanner-free and wide-field endoscopic imaging by using a single multimode optical fiber,¡± Physical Review Letters, 109 203901 (2012)
3. Moonseok Kim, Youngwoon Choi, Changhyeong Yoon, Wonjun Choi, Jaisoon Kim, Q-Han Park and Wonshik Choi, "Maximal energy transport through disordered media with the implementation of transmission eigenchannels," Nature Photonics, 6 581 (2012)