Observation of dipolar transport in one-dimensional photonic lattices

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（5）
• 页码范围: 339-344
• 页数: 6页
• 语种: 英文

摘要

We experimentally study the transport properties of dipolar and fundamental modes on one dimensional (1D) coupled waveguide arrays.By carefully modulating a wide optical beam,we are able to effectively excite dipolar or fundamental modes to study discrete diffraction (single-site excitation) and gaussian beam propagation (multi-site excitation plus a phase gradient).We observe that dipolar modes experience a larger spreading area due to an effective larger coupling constant,which is found to be more than two times larger than the one for fundamental modes.Additionally,we study the effect of non-diagonal disorder and find that while fundamental modes are already trapped on a weakly disorder array,dipoles are still able to propagate across the system.