Biomedical subjects

Barak Freedman

Publications and source records attributed to Barak Freedman.

2 recordsLinked to original sources

PubMed2004

Grating-mediated waveguiding.

We propose a method of optical waveguiding, which relies on Bragg diffractions from a 1D grating that gives rise to waveguiding in the direction normal to the grating wave vector. The waveguide structure consists of a shallow 1D grating that has a bell- or trough-shaped amplitude in the confinement direction. Finally, we provide an experimental proof of the concept for this mechanism.

Journal Article↗

PubMed2003

Observation of locked optical kink-antikink spatial shock waves.

We report the first experimental observation of optical spatial shock-wave pairs. The shock waves consist of two coupled kink and antikink beams that remain locked to each other throughout propagation in a nonlinear diffusion-driven photorefractive crystal. These coupled shock-wave pairs move undistorted at angles that fall outside their original angular sector of propagation.

Journal Article↗