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arXiv 2201.07842physics.opticsphysics.app-ph
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利用光感生磁性对等离子体阻尼进行主动调谐

Active tuning of plasmon damping via light induced magnetism

Oscar Hsu-Cheng Cheng, Boqin Zhao, Zachary Brawley, Dong Hee Son, Matthew Sheldon

摘要:

等离子体纳米结构的圆偏振光激发导致其电子的相干循环运动,这反过来又引起强的光诱导磁化-一种被称为逆法拉第效应(IFE)的现象。在这项研究中,我们报告如何IFE也显着降低等离子体阻尼。通过将入射到非手性等离子体纳米结构上的光偏振态从线性调制到圆形,我们观察到在10^9 W/m^2连续波(CW)光激发下,反射率可逆增加了78%,同时光场浓度增加了35.7%。在存在外部施加的磁场(0.2 T)的情况下,还监测了等离子体激元阻尼降低的这些特征。结合的相互作用允许估计光致磁化,其对应于圆极化CW激发(10^9 W/m^2)期间约1.3 T的有效磁场。我们合理化的洛伦兹力作用于循环电子轨迹的等离子体激元阻尼观察到的减少。我们的研究结果概述了主动调制金属中的固有损耗的策略,从而通过编码在入射光的偏振态中的光磁效应来调制光模质量和场集中。

英文摘要:

Circularly polarized optical excitation of plasmonic nanostructures causes coherent circulating motion of their electrons, which in turn, gives rise to strong optically induced magnetization - a phenomenon known as the inverse Faraday effect (IFE). In this study we report how the IFE also significantly decreases plasmon damping. By modulating the optical polarization state incident on achiral plasmonic nanostructures from linear to circular, we observe reversible increases of reflectance by 78% as well as simultaneous increases of optical field concentration by 35.7% under 10^9 W/m^2 continuous wave (CW) optical excitation. These signatures of decreased plasmon damping were also monitored in the presence of an externally applied magnetic field (0.2 T). The combined interactions allow an estimate of the light-induced magnetization, which corresponds to an effective magnetic field of ~1.3 T during circularly polarized CW excitation (10^9 W/m^2). We rationalize the observed decreases in plasmon damping in terms of the Lorentz forces acting on the circulating electron trajectories. Our results outline strategies for actively modulating intrinsic losses in the metal, and thereby, the optical mode quality and field concentration via opto-magnetic effects encoded in the polarization state of incident light.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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