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arXiv 2404.04569physics.opticscond-mat.mes-hall
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Mie共振处的逆Faraday效应

The inverse Faraday effect at Mie resonances

Denis M. Krichevsky, Daria O. Ignatyeva, Vladimir I. Belotelov

AI总结:

本文理论与模拟研究Mie共振诱导的逆Faraday效应,发现其产生非均匀有效磁场和涡旋结构,可通过泵浦波长控制点状磁场源以选择性激发亚微米自旋波并生成磁性斯格明子,拓宽了纳米光磁性范围。

摘要:

如今,介电纳米光子学实现了纳米尺度上光与物质之间几乎无损耗的共振相互作用。我们通过理论和电磁模拟表明,Mie共振诱导的有效磁场的独特性质与平滑体材料的光磁性形成鲜明对比。Mie共振产生由逆Faraday效应引起的强烈非均匀有效磁场。不同阶的光学共振具有不同类型的有效磁场模式。通过调节泵浦波长可以控制点状逆Faraday效应源的数量,从而实现亚微米波长自旋波的选择性激发。Mie共振诱导的有效磁场的一个显著特征是其涡旋结构,可用于磁性斯格明子的生成。所提出的方法显著拓宽了纳米尺度光磁性的范围。

英文摘要:

Nowadays, dielectric nanophotonics enables almost lossless resonant interaction between light and matter at the nanoscale. We show both theoretically and by electromagnetic simulations, that the peculiar nature of Mie-resonance induced effective magnetic fields contrasts sharply with the optomagnetism of smooth bulk materials. Mie resonances produce strongly nonuniform effective magnetic fields generated by the inverse Faraday effect. Different orders of optical resonances are characterized by different types of the effective magnetic field patterns. The number of point-like inverse Faraday effect sources can be controlled by adjusting the pump wavelength, allowing for the selective launch of spin waves with submicron wavelengths. A distinguish feature of the Mie-resonance-induced effective magnetic fields is the vortex structure that can be used for the magnetic skyrmion generation. The proposed approach considerably broadens the scope of nanoscale optomagnetism.

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