论文标题
基于石墨烯的液体纳米结构的阴极发光的电动方向转向
Electric directional steering of cathodoluminescence from graphene-based hydrid nanostructures
论文作者
论文摘要
控制纳米光辐射源的定向发射是量身定制辐射 - 辐射 - 辐射介质的基础，并为芯片无线通信和信息处理设置高效的纳米光效率设备。事实证明，与量子发射器结合的纳米antennanas是非常有效的辐射路由器，而通过电子的非弹性隧道，已经实现了单向发射的电气控制。在这里，我们证明，从高能电子束与石墨烯 - 纳米颗粒复合材料的相互作用发出的辐射具有横梁方向，即使通过石墨烯费米能量的小变化，也可以使整个圆连续跨越整个圆。发射方向性源于双锥形电子过渡辐射与纳米颗粒偶极衍射辐射之间的干扰。启用可调性是因为干扰由纳米颗粒偶极矩统治，纳米颗粒偶极矩的振幅和相位由复合材料的混合等离子共振驱动，并且分别由电子发射的石墨烯等离激元偏光基的绝对相驱动。我们方法的灵活性提供了一种利用石墨烯等离子体物理学的方法，可以通过超快可重构辐射模式来构想改进的纳米库。
Controlling directional emission of nanophotonic radiation sources is fundamental to tailor radiation-matter interaction and to conceive highly efficient nanophotonic devices for on-chip wireless communication and information processing. Nanoantennas coupled to quantum emitters have proven to be very efficient radiation routers, while electrical control of unidirectional emission has been achieved through inelastic tunneling of electrons. Here we prove that the radiation emitted from the interaction of a high-energy electron beam with a graphene-nanoparticle composite has beaming directions which can be made to continuously span the full circle even through small variations of the graphene Fermi energy. Emission directionality stems from the interference between the double cone shaped electron transition radiation and the nanoparticle dipolar diffraction radiation. Tunability is enabled since the interference is ruled by the nanoparticle dipole moment whose amplitude and phase are driven by the hybrid plasmonic resonances of the composite and the absolute phase of the graphene plasmonic polariton launched by the electron, respectively. The flexibility of our method provides a way to exploit graphene plasmon physics to conceive improved nanosources with ultrafast reconfigurable radiation patterns.
