The Bernstein Center for Computational Neuroscience Freiburg

Announcement for the next
Informal Seminar
Dr. Ivo Vellekoop
University of Twente, Enschede, Holland

Opaque lenses: controlling light propagation in disordered materials

June 5th, 2008
2:00 pm
Center Court (5th floor), Schaenzlestr. 1
White materials, such as white paint, bone and brain tissue, scatter light. Light that propagates in such materials will become diffuse (i.e. it loses directionality). For a long time, it was thought that diffusion of light is irreversible. However, we have shown experimentally that diffusion of light can be reversed. By shaping the incident light beam, we have made normally opaque objects, such as an eggshell, focus light. These opaque objects focus the transmitted light as sharply as a lens. Additionally, light was focused deep inside opaque objects. I will present the basic ideas, the apparatus and algorithms, and our experimental results. In addition, I will discuss some potential applications of our methods.
The talk is open to the public. Guests are cordially invited!