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  05.02.2014 - Structured light meets structured material: concepts and applications - Seminario

 Giovedì 6 febbraio, alle ore 12.00, presso l'aula seminari, il dott. Dr. Ebrahim Karimi, University of Ottawa, Canada, terrà un seminario dal titolo:
"Structured light meets structured material: concepts and applications".

Abstract: Optical beams are solution to the Maxwell equations - neglecting a small longitudinal component along propagation direction in the paraxial regime - are fairly transverse. Beside linear momentum (wavenumber) and polarization (spin angular momentum), there are at least two independent indices that define the transverse structure of an optical field associated with the transversality of the optical field. These transverse degrees of freedom are associated with phase structures of the azimuthal and radial modes of a photon in the cylindrical coordinates. A beam with specific transverse modes and polarization states results in a complex space-variant distribution known as vector beam. Surprisingly, such a beam in the single photon regime leads to a single photon multi-degrees of freedom entangled state suitable for novel quantum applications. On the other hand, since the beginning of optics materials - in different geometrical topologies - are widely used to manipulate optical beams. Lenses and prisms are the most simple and common examples in which are used to adjust the beam phase front or wavenumber (in terms of dispersion). However, more recently it has been shown that material possessing specific topology can be used to make different degrees of freedom of light into interact, resulting complex vector beams. In my talk, I will discuss such a concept and application of such a novel designed devices in the quantum information applications.

Ebrahim Karimi's bibliography:
Ebrahim Karimi received his B.Sc and M.Sc. degrees in Physics with emphasis in mathematics from Kerman University and IASBS in 2001 and 2003, respectively. After that, he joined the University of Kurdistan as a researcher in 2004. In 2009, he received his PhD degree, titled "Light orbital angular momentum and its application on the classical and quantum information", from the University of Naples “Federico II” under supervision of Lorenzo Marrucci and Enrico Santamato. After his PhD, he worked as a postdoctoral fellow at the University of Napoli "Federico II" under the european PHORBITECH project. He currently works in the Quantum Optics section of Robert W. Boyd's group.

Ref. Prof. G. Gigli