12 October 2005 Negative refraction in tunable periodic photonic structures
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Abstract
We predict theoretically and observe experimentally tunable refraction of beams in optically-induced lattices. By selective excitation of diferent Bloch modes in a tilted lattice, we observe positive and negative refraction for beams associated with the first and the second spectral band, respectively. We demonstrate tunability of the output beam position by dynamically adjusting the lattice depth. At higher laser intensities, the beam broadening due to difraction can be suppressed through nonlinear self-focusing while preserving the general steering properties.
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Christian R. Rosberg, Dragomir N. Neshev, Andrey A. Sukhorukov, Wieslaw Krolikowski, Yuri S. Kivshar, "Negative refraction in tunable periodic photonic structures", Proc. SPIE 5950, Photonic Crystals and Fibers, 59500C (12 October 2005); doi: 10.1117/12.622634; https://doi.org/10.1117/12.622634
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