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Anomalous refraction and diffraction in discrete optical systems

: Pertsch, T.; Zentgraf, T.; Peschel, U.; Bräuer, A.; Lederer, F.


Physical review letters 88 (2002), Nr.9, Art. 093901, 4 S.
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IOF ()
discrete system; light diffraction; light refraction; light propagation; optical array; polymers; silicon

We experimentally prove that light propagation in a discrete system, i. e., an array of coupled waveguides, exhibits striking anomalies. We show that refraction is restricted to a cone, irrespective of the initial tilt of the beam. Diffraction can be controlled in size and sign by the input conditions. Diffractive beam spreading can even be arrested and diverging light can be focused. The results can be thoroughly theoretically explained.