Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering

Seungwon Jeong, Ye Ryoung Lee, Wonjun Choei, Sungsam Kang, Jin Hee Hong, Jin Sung Park, Yong Sik Lim, Hong Gyu Park, Wonshik Choi

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

The efficient delivery of light energy is a prerequisite for the non-invasive imaging and stimulating of target objects embedded deep within a scattering medium. However, the injected waves experience random diffusion by multiple light scattering, and only a small fraction reaches the target object. Here, we present a method to counteract wave diffusion and to focus multiple-scattered waves at the deeply embedded target. To realize this, we experimentally inject light into the reflection eigenchannels of a specific flight time to preferably enhance the intensity of those multiple-scattered waves that have interacted with the target object. For targets that are too deep to be visible by optical imaging, we demonstrate a more than tenfold enhancement in light energy delivery in comparison with ordinary wave diffusion cases. This work will lay a foundation to enhance the working depth of imaging, sensing and light stimulation.

Original languageEnglish
Pages (from-to)277-283
Number of pages7
JournalNature Photonics
Volume12
Issue number5
DOIs
Publication statusPublished - 2018 May 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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