Coherence and Disorder
(Flavio Mariani, Martin van Exter)

Coherence_Disorder Using spatial light modulators, a beam of light can be shaped to have a structure in intensity and also in phase. On the right side, the two regions differ by a phase shift of pi, whereas on the left a random phase pattern is introduced of the kind used to study the properties of an absorbing random scattering medium.

In this project we study the effect of disordered 2D and 3D scattering media on light propagation and the resulting variations in the optical density. We investigate it in particular in relation with absorbing materials and light emitters, such as solar cells and LEDS, with the purpose to optimize the interaction of these structure with radiation using scattering in combination with the technique of optical wavefront shaping.

 

Nanostructured random media, generally associated with light diffusion, have recently been shown to possess intriguing properties. They can act as spectral filters, enhance light emission from chromophores, and possibly even exhibit localizing optical states (Anderson localization).