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.
© 2010 Optical Society of America
Diffraction and Gratings
Original Manuscript: October 6, 2009
Manuscript Accepted: February 12, 2010
Published: March 15, 2010
Peng Zhang, Cibo Lou, Sheng Liu, Jianlin Zhao, Jingjun Xu, and Zhigang Chen, "Tuning of Bloch modes, diffraction, and refraction by two-dimensional lattice reconfiguration," Opt. Lett. 35, 892-894 (2010)