Nearfield control over magnetic light-matter interactions

IF 20.6 Q1 OPTICS
Benoît Reynier, Eric Charron, Obren Markovic, Bruno Gallas, Alban Ferrier, Sébastien Bidault, Mathieu Mivelle
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Abstract

Light-matter interactions are frequently perceived as predominantly influenced by the electric field, with the magnetic component of light often overlooked. Nonetheless, the magnetic field plays a pivotal role in various optical processes, including chiral light-matter interactions, photon-avalanching, and forbidden photochemistry, underscoring the significance of manipulating magnetic processes in optical phenomena. Here, we explore the ability to control the magnetic light and matter interactions at the nanoscale. In particular, we demonstrate experimentally, using a plasmonic nanostructure, the transfer of energy from the magnetic nearfield to a nanoparticle, thanks to the subwavelength magnetic confinement allowed by our nano-antenna. This control is made possible by the particular design of our plasmonic nanostructure, which has been optimized to spatially decouple the electric and magnetic components of localized plasmonic fields. Furthermore, by studying the spontaneous emission from the Lanthanide-ions doped nanoparticle, we observe that the measured field distributions are not spatially correlated with the experimentally estimated electric and magnetic local densities of states of this antenna, in contradiction with what would be expected from reciprocity. We demonstrate that this counter-intuitive observation is, in fact, the result of the different optical paths followed by the excitation and emission of the ions, which forbids a direct application of the reciprocity theorem.

Abstract Image

磁光物质相互作用的近场控制
光与物质的相互作用通常被认为主要受电场的影响,而光的磁性成分往往被忽视。尽管如此,磁场在各种光学过程中起着关键作用,包括手性光-物质相互作用、光子雪崩和禁止光化学,强调了在光学现象中操纵磁过程的重要性。在这里,我们探索在纳米尺度上控制磁光和物质相互作用的能力。特别是,我们通过实验证明,利用等离子体纳米结构,由于我们的纳米天线允许的亚波长磁约束,能量从磁性近场转移到纳米颗粒。这种控制是通过我们的等离子体纳米结构的特殊设计实现的,该结构经过优化,可以在空间上解耦局部等离子体场的电和磁分量。此外,通过研究镧系离子掺杂纳米粒子的自发发射,我们观察到测量的场分布与实验估计的该天线的电和磁局域密度在空间上不相关,这与互易性的预期相矛盾。我们证明了这种反直觉的观察实际上是离子激发和发射后不同光路的结果,这禁止了互易定理的直接应用。
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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
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发文量
803
审稿时长
2.1 months
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