YIG纳米波导中短波长自旋波的空间扩展非线性产生
Spatially-extended nonlinear generation of short-wavelength spin waves in YIG nanowaveguides
AI总结：
本研究通过实验在经色散设计的YIG微观波导中实现四磁振子相互作用，非线性产生短波长自旋波，该过程阈值低、适用范围广，可补偿传播损耗，为磁振子纳米器件的频率与波长转换提供新途径。
摘要：
我们通过实验研究了微观钇铁石榴石（YIG）波导中自旋波的非线性传播，该波导的色散谱经过设计，可在宽波长范围内实现高效的四磁振子相互作用。我们发现，在这些条件下，初始的单色自旋波会非线性地产生具有明确离散频率的共传播自旋波。该过程的能量阈值较低，可在很宽的频率范围和激发功率范围内被观测到。得益于经过设计的色散特性，这一过程能够产生短波长的波，而这类短波长波无法通过线性激发机制直接激发。非线性产生的短波长自旋波在共传播过程中会持续从初始泵浦波获取能量，从而在相当长的距离内补偿其传播损耗。观测到的这一现象可用于在磁振子纳米器件和电路中实现频率与波长转换操作。
英文摘要：
We experimentally study nonlinear propagation of spin waves in microscopic yttrium iron garnet waveguides, where the dispersion spectrum is engineered to enable efficient four-magnon interactions over a wide range of wavelengths. We show that under these conditions, the initial monochromatic spin wave nonlinearly generates co-propagating spin waves with well-defined, discrete frequencies. This process is characterized by a low energy threshold and can be observed in a wide range of frequencies and excitation powers. Thanks to the engineered dispersion, the process allows the generation of waves with short wavelengths that cannot be excited directly by a linear excitation mechanism. The nonlinearly generated short-wavelength spin waves continuously acquire the energy from the initial pump wave during co-propagation, which results in compensation of their propagation losses over significant distances. The observed phenomena can be used to implement frequency- and wavelength-conversion operations in magnonic nanodevices and circuits.
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