Nontrivial Bloch oscillations in waveguide arrays with second-order coupling

Under the influence of the next-nearest-neighbor interaction, we theoretically investigate the occurrence of Bloch oscillations in zigzag waveguide arrays. Because of the special topological configuration of the lattice itself, the second-order coupling (SOC) can be enhanced significantly and leads...

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Bibliographic Details
Published in:Optics letters 2010-06, Vol.35 (11), p.1908-1910
Main Authors: Wang, Gang, Huang, Ji Ping, Yu, Kin Wah
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optical elements, devices, and systems
Optical waveguides and coupleurs
Optics
Physics
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Summary:Under the influence of the next-nearest-neighbor interaction, we theoretically investigate the occurrence of Bloch oscillations in zigzag waveguide arrays. Because of the special topological configuration of the lattice itself, the second-order coupling (SOC) can be enhanced significantly and leads to the band alteration beyond the nearest-neighbor model, i.e., the offset of minimum value from the band edge. Contrary to the behavior in the vanishing SOC, the oscillation patterns exhibit new features, namely, a double turning-back occurs when the beam approaches the band edge. Our results can be applied to some ordered-lattice systems.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.35.001908