Chau K J, Johnson Mark, Elezzabi A Y
Ultrafast Photonics and Nano-Optics Laboratory, Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada.
Phys Rev Lett. 2007 Mar 30;98(13):133901. doi: 10.1103/PhysRevLett.98.133901. Epub 2007 Mar 29.
In this Letter, we demonstrate that electron spin can influence near-field mediated light propagation through a dense ensemble of subwavelength bimetallic ferromagnetic/nonmagnetic microparticles. In particular, we show that ferromagnetic particles coated with nonmagnetic metal nanolayers exhibit an enhanced magnetic field controlled attenuation of the electromagnetic field propagated through the sample. The mechanism is related to dynamic, electromagnetically induced electron spin accumulation in the nonmagnet. The discovery of an electron spin phenomenon in the light interaction with metallic particles opens the door to the marriage of spintronic and plasmonic technologies and could pave the way for the development of light-based devices that exploit the electron spin state.
在本信函中，我们证明了电子自旋能够影响通过密集的亚波长双金属铁磁/非磁性微粒系综的近场介导光传播。特别地，我们表明，包覆有非磁性金属纳米层的铁磁颗粒，对于传播通过样品的电磁场，呈现出增强的磁场控制衰减。其机制与非磁体中动态的、电磁诱导的电子自旋积累有关。在光与金属颗粒相互作用中发现电子自旋现象，为自旋电子学和等离子体技术的结合打开了大门，并可能为开发利用电子自旋态的光基器件铺平道路。
