标题： 可调谐磁振子发射来自纳米光磁器件 显示英文标题

标题： Tunable magnon emission from a nano-optomagnet

摘要： 不断增长的对密集、节能和高频信号处理的需求继续推动器件微型化。 尽管缩小尺寸仍然是一个核心挑战，自旋波作为一种纳米尺度的信号载体，提供了有希望的解决方案，在不使用移动电荷载流子的情况下支持从GHz到THz的宽带操作，并产生焦耳加热。 然而，它们在纳米尺度上的集成受到基于共面波导的传统电信号激发的限制，这些共面波导需要几微米到几百微米大小的金属垫。 在这里，我们通过将微波调制激光光聚焦到集成的金纳米盘上，展示了可调谐的自旋波发射到钇铁石榴石薄膜中。 使用非弹性光散射光谱学，我们观察到其频率与GHz频段内的光学调制频率相匹配的自旋波。 最大的自旋波振幅出现在圆偏振激光光和特定直径的纳米盘上，这与等离激元增强的逆法拉第效应一致。 这些结果确立了等离激元纳米天线作为可重构的纳米尺度自旋波源，实现了完全由光学调制控制的宽带信号生成。 显示英文摘要

摘要： The growing demand for dense, energy-efficient, and high-frequency signal processing continues to drive device miniaturization. While downscaling remains a central challenge, magnons offer a promising solution as nanoscale signal carriers, supporting broadband operation from GHz to THz without moving charge carriers and generating Joule heating. However, their integration at the nanoscale is limited by conventional electrical excitation based on coplanar waveguides, which require metal pads few to hundreds of micrometres in size. Here, we demonstrate tunable magnon emission into a yttrium iron garnet film by focusing microwave-modulated laser light onto an integrated Au nanodisc. Using inelastic light scattering spectroscopy, we observe magnons whose frequencies match the optical modulation frequencies in the GHz frequency regime. The largest magnon amplitudes are found for circularly polarized laser light and specific nanodisc diameters consistent with a plasmon-enhanced inverse Faraday effect. These results establish plasmonic nanoantennas as reconfigurable nanoscale magnon sources, enabling broadband signal generation governed entirely by optical modulation.