Ji Kunhao, Davidson Ian, Sahu Jayanta, Richardson David J, Wabnitz Stefan, Guasoni Massimiliano
Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
Microsoft (Lumenisity Limited), Unit 7, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL, United Kingdom.
Nat Commun. 2023 Nov 24;14(1):7704. doi: 10.1038/s41467-023-42869-0.
Novel fundamental notions helping in the interpretation of the complex dynamics of nonlinear systems are essential to our understanding and ability to exploit them. In this work we predict and demonstrate experimentally a fundamental property of Kerr-nonlinear media, which we name mode rejection and takes place when two intense counter-propagating beams interact in a multimode waveguide. In stark contrast to mode attraction phenomena, mode rejection leads to the selective suppression of a spatial mode in the forward beam, which is controlled via the counter-propagating backward beam. Starting from this observation we generalise the ideas of attraction and rejection in nonlinear multimode systems of arbitrary dimension, which paves the way towards a more general idea of all-optical mode control. These ideas represent universal tools to explore novel dynamics and applications in a variety of optical and non-optical nonlinear systems. Coherent beam combination in polarisation-maintaining multicore fibres is demonstrated as example.
有助于解释非线性系统复杂动力学的新颖基本概念对于我们理解和利用这些系统的能力至关重要。在这项工作中，我们通过实验预测并证明了克尔非线性介质的一种基本特性，我们将其命名为模式抑制，它发生在两个强烈的反向传播光束在多模波导中相互作用时。与模式吸引现象形成鲜明对比的是，模式抑制导致前向光束中一个空间模式的选择性抑制，这是通过反向传播的后向光束来控制的。基于这一观察结果，我们推广了任意维度非线性多模系统中吸引和抑制的概念，这为更普遍的全光模式控制理念铺平了道路。这些概念代表了探索各种光学和非光学非线性系统中新颖动力学和应用的通用工具。作为示例，展示了保偏多芯光纤中的相干光束合成。
