Optomagnets in nonmagnetic plasmonic nanostructures.
Optomagnets in nonmagnetic plasmonic nanostructures.
复制标题
非磁性等离子体纳米结构中的光磁体。
作者：
Vage Karakhanyan;Yannick Lefier;C. Eustache;T. Grosjean
利用金属自由电子气的简化流体力学模型，从理论上研究了等离子体纳米结构中的光致直流电流环。这种电流回路源于依赖三个电动势的光学整流过程，其中一个电动势来自光学自旋-轨道相互作用。由此产生的静态磁场被发现是最大的，并显著限制在等离子体纳米结构的角落，这揭示了金属间断在纳米尺度上集中和定制静态磁场的能力。因此，等离子体可以在纳米尺度上产生和调节静态磁场和强磁力，潜在地影响小规模的磁钳和传感，以及磁光效应和自旋波的产生。
Using a simplified hydrodynamic model of the free electron gas of a metal, we theoretically investigate optically induced DC current loops in a plasmonic nanostructure. Such current loops originate from an optical rectification process relying on three electromotive forces, one of which arises from an optical spin-orbit interaction. The resulting static magnetic field is found to be maximum and dramatically confined at the corners of the plasmonic nanostructure, which reveals the ability of metallic discontinuities to concentrate and tailor static magnetic fields on the nanoscale. Plasmonics can thus generate and tune static magnetic fields and strong magnetic forces on the nanoscale, potentially impacting small scale magnetic tweezing and sensing as well as the generation of magneto-optical effects and spin waves.