Wiersma Noémi, Marsal Nicolas, Sciamanna Marc, Wolfersberger Delphine
Université de Lorraine, LMOPS/CentraleSupélec (EA 4423), Metz, 57070, France.
CentraleSupélec, OPTEL Research Group, LMOPS (EA 4423), Metz, 57070, France.
Sci Rep. 2015 Aug 28;5:13463. doi: 10.1038/srep13463.
We analyse theoretically the spatiotemporal dynamics of two incoherent counterpropagating Airy beams interacting in a photorefractive crystal under focusing conditions. For a large enough nonlinearity strength the interaction between the two Airy beams leads to light-induced waveguiding. The stability of the waveguide is determined by the crystal length, the nonlinearity strength and the beam's intensities and is improved when comparing to the situation using Gaussian beams. We further identify the threshold above which the waveguide is no longer static but evolves dynamically either time-periodically or even chaotically. Above the stability threshold, each Airy-soliton moves erratically between privileged output positions that correspond to the spatial positions of the lobes of the counterpropagating Airy beam. These results suggest new ways of creating dynamically varying waveguides, optical logic gates and chaos-based computing.
我们从理论上分析了在聚焦条件下，两束非相干反向传播的艾里光束在光折变晶体中相互作用的时空动力学。对于足够大的非线性强度，两束艾里光束之间的相互作用会导致光致波导。波导的稳定性由晶体长度、非线性强度和光束强度决定，与使用高斯光束的情况相比，其稳定性得到了提高。我们进一步确定了一个阈值，超过该阈值，波导不再是静态的，而是会以时间周期甚至混沌的方式动态演化。在稳定性阈值之上，每个艾里孤子在对应于反向传播艾里光束波瓣空间位置的特权输出位置之间不规则地移动。这些结果为创建动态变化的波导、光学逻辑门和基于混沌的计算提供了新方法。
