Pizza, Optics and Beer - October

The EPFL Photonics Chapter (EPC) is very pleased to announce and cordially invite you to our monthly 'Pizza-optics-beer' (POB) seminar on October 4th 2017 (Wednesday) at 18:15 in the room CM 1 120.

This month we will have the pleasure to host Alexandre Goy with the presentation entitled

"Learning optical tomography"

For organizational purposes (if you want to eat pizza!), please confirm your participation using this Doodle.
 
Hope to see you there,
The team of the EPFL Photonics Chapter
 
 
Abstract:
Optical tomography is an imaging technique that aims at reconstructing the three-dimensional distribution of the refractive index of a sample. This can be used, for example, in biology to study the structure of cells in three dimensions and how cell get organized in space. In order to reconstruct the refractive index, the object is illuminated with plane waves at different incidence angles. For each incident wave, the scattered field is measured. By using a simple linear inversion method, it is possible to retrieve the refractive index from these measurements. However, this conventional method (based on the Rytov approximation) does not account for multiple scattering and is thus limited to weakly scattering object, i.e. object displaying weak index contrast.
In this talk, we will present a recent method called Learning tomography (LT) that includes multiple scattering and thus allows us to expand the limits of optical tomography. We will explain the working principle of LT and show its advantages over conventional linear techniques.