Tuning of Bloch modes, diffraction, and refraction by two-dimensional lattice reconfiguration.
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.
Zhang
Peng
P
Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China. pengzhang.npu@gmail.com
Lou
Cibo
C
Liu
Sheng
S
Zhao
Jianlin
J
Xu
Jingjun
J
Chen
Zhigang
Z