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Opt Lett. 2010 Mar 15;35(6):892-4. doi: 10.1364/OL.35.000892.

Tuning of Bloch modes, diffraction, and refraction by two-dimensional lattice reconfiguration.

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Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.


We demonstrate controlled excitation of Bloch modes and manipulation of diffraction and refraction in optically induced two-dimensional photonic lattices. Solely by adjusting the bias condition, the lattice structures can be reconfigured at ease, enabling the observation of transition between Bloch modes associated with different high-symmetry points of a photonic band, and interplay between normal and anomalous diffraction as well as positive and negative refraction under identical excitation condition.

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