"Can we see through paint?"
PHYSICS DEPARTMENT COLLOQUIUM
Can We See Through Paint? Sylvain Gigan
Institut Langevin, ESPCI
Light entering a scattering medium, a layer of paint or a biological tissue for instance,
endures a complex random propagation that seemingly destroys all spatial information,
rapidly preventing imaging or focusing. I will present a method to measure the transmission
matrix of a scattering medium, i.e. the relationship between what enters and what goes
through the medium, independently of how long and random the propagation has been.
We show that not only are we able to focus light through an opaque layer of paint,
but we are also able to reconstruct or "view" a simple object through it.
Beyond the obvious imaging applications, we show that this technique also provides
a new tool to understand and study the very rich domain of the propagation of
waves in complex media.
February 20, 2013 (Wednesday)