Delocalized Hot Electron Generation with Propagative Surface Plasmon Polaritons,ACS Photonics

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Delocalized Hot Electron Generation with Propagative Surface Plasmon Polaritons
ACS Photonics ( IF 6.5 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acsphotonics.9b00245
Romain Hernandez ₁ , Renato Juliano Martins ₁ , Adrian Agreda ₁ , Marlene Petit ₁ , Jean-Claude Weeber ₁ , Alexandre Bouhelier ₁ , Benoit Cluzel ₁ , Olivier Demichel ₁

Affiliation

Hot electrons generated within plasmonic structures possess a high kinetic energy that can be employed to drive and catalyze a huge range of physicochemical processes at the metallic interface. Up to now, these photogenerated hot carriers were mainly generated within simple plasmonic nanoparticles where hot carrier localization coincides spatially with the position optical excitation. A current challenge for the development of future plasmonic-based hot electron devices requires the ability for a delocalized hot carrier production to control on a large-distance their spatial distribution. Here, we demonstrate the remote generation of hot electrons by launching a propagative surface plasmon on a gold waveguide. Such hot carriers can be produced at distances of several microns from the excitation. Moreover, using far- and near-field hyperspectral microscopy, we show that hot carriers present spatial and energy distributions driven by the propagating plasmon field distribution itself. This opens the door to the engineering of complex hot carrier devices through the management of the plasmon propagation for next level hot-electron-based applications.

中文翻译：

带有表面等离激元极化子的离域热电子生成

在等离激元结构内产生的热电子具有很高的动能，可用于驱动和催化金属界面处的各种物理化学过程。到目前为止，这些光生热载流子主要是在简单的等离激元纳米粒子中产生的，其中，热载流子的位置在空间上与位置光激发相吻合。未来基于等离激元的热电子器件的发展面临的当前挑战要求能够进行离域热载流子生产以控制其大范围的空间分布。在这里，我们通过在金波导上发射传播的表面等离子体激元来演示热电子的远程生成。可以在距激发几微米的距离处产生这种热载流子。而且，使用远场和近场高光谱显微镜，我们显示热载流子呈现出由传播的等离激元场分布本身驱动的空间和能量分布。通过为下一级基于热电子的应用进行等离激元传播的管理，这为复杂的热载流子设备的工程设计打开了大门。

更新日期：2019-05-22

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