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Metasurface with Engineered Wavefront with Huygens, Fermat, Bragg, Friedel and Fresnel Laws

August 13, 2014 11:00AM to 12:00PM
Presenter 
Zeno Gaburro, University of Trento, Italy
Location 
Building 241, Room D172
Type 
Seminar
Abstract:
I propose a metasurface that generalizes classical Snell and Fresnel laws, based on phase discontinuities. I provide an outlook on this structure, from different and complementary points of view, referred to classical Huygens, Fermat, Bragg, Friedel and Fresnel laws.

The structure shows a generalization of the concept of crystallographic systematic absence. As a result, the Friedel law of crystals completely breaks down. A novel concept of "metacrystal" can be introduced, where systematic absences can be originated from form factors of meta-atoms, in contrast with natural absences, which are based on structure factors only. Applications will be also presented.

References:
N. Yu, P. Genevet, M.A. Kats, F. Aieta, J.P. Tetienne, F. Capasso and Z. Gaburro, Science 334, 333-337 (2011).