Nikolaev K O, Lake S R, Schmidt G, Demokritov S O, Demidov V E
Institute of Applied Physics, University of Muenster, 48149, Muenster, Germany.
Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120, Halle, Germany.
Nat Commun. 2024 Feb 28;15(1):1827. doi: 10.1038/s41467-024-46108-y.
Generation of second-harmonic waves is one of the universal nonlinear phenomena that have found numerous technical applications in many modern technologies, in particular, in photonics. This phenomenon also has great potential in the field of magnonics, which considers the use of spin waves in magnetic nanostructures to implement wave-based signal processing and computing. However, due to the strong frequency dependence of the phase velocity of spin waves, resonant phase-matched generation of second-harmonic spin waves has not yet been achieved in practice. Here, we show experimentally that such a process can be realized using a combination of different modes of nano-sized spin-wave waveguides based on low-damping magnetic insulators. We demonstrate that our approach enables efficient spatially-extended energy transfer between interacting waves, which can be controlled by the intensity of the initial wave and the static magnetic field.
二次谐波的产生是一种普遍存在的非线性现象，它在许多现代技术，特别是光子学中有着众多的技术应用。这种现象在磁子学领域也具有巨大潜力，磁子学考虑在磁性纳米结构中利用自旋波来实现基于波的信号处理和计算。然而，由于自旋波相速度对频率的强烈依赖性，二次谐波自旋波的共振相位匹配产生在实际中尚未实现。在此，我们通过实验表明，使用基于低阻尼磁绝缘体的纳米尺寸自旋波波导的不同模式组合可以实现这一过程。我们证明，我们的方法能够在相互作用的波之间实现高效的空间扩展能量转移，这可以通过初始波的强度和静磁场来控制。
