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Visual observation of Zener tunneling

: Trompeter, H.; Michaelis, D.; Streppel, U.; Pertsch, T.; Peschel, U.; Lederer, F.; Bräuer, A.


Physical review letters 96 (2006), No.2, Art. 023901
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article
Fraunhofer IOF ()
Zener tunnelling; block oscillation; waveguide array

We experimentally investigate photonic Zener tunneling between the bands of a waveguide array by directly monitoring the propagating light inside this structure. For strong transverse index gradients we observe Zener breakdown as regular outbursts of radiation escaping from the Bloch oscillations. Tunneling to higher order photonic bands and Bloch oscillations in different bands have been detected.