Enabling focusing around the corner in multiple scattering media

Reijn, Saara-Maarit, Pinheiro, Felipe A., Geskus, Dimitri and Wetter, Niklaus U. (2015) Enabling focusing around the corner in multiple scattering media. Applied Optics, 54 (25), 7740-7746. (doi:10.1364/AO.54.007740).

Abstract

We report an alternative experimental setup to laterally focus light at an angle of 90 deg relative to turbid, multiple scattering media, using preprocessing wavefront shaping. We compare the measured image quality to one obtained in the usual configuration for focusing light through turbid media, where focusing occurs behind the scattering sample. We demonstrate that the depth of focus in the lateral configuration is of the same order of the usual transversal one because both setups are designed to operate in the deep Fresnel zone. This result shows that this novel, versatile lateral configuration allows for effectively focusing around corners through multiple scattering samples.

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