Elibol Kenan, Burghard Marko, Heil Tobias, van Aken Peter A
Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany.
ACS Appl Mater Interfaces. 2024 Oct 23;16(42):57501-57511. doi: 10.1021/acsami.4c12205. Epub 2024 Oct 14.
Accurate control of charge transfer pathways is critical to unlocking the full potential of charge transfer plasmons (CTPs) and exploring their diverse applications. We show that the intentional manipulation of junctions in Al nanocrosses on graphene induces asymmetry, unlocking unexpected charge transfer pathways and facilitating the generation of coupled resonators. The junction asymmetry, which is induced by nanotrench formation facilitated by focused electron beam irradiation, provides a versatile means to achieve precise and controlled interconnect manipulation. We find that tuning the nanotrench dimensions in nanocrosses allows for the tailored modulation of the charge transfer speed and the energies of CTPs. Furthermore, CTPs excited in our experimental nanocrosses, featuring nanotrenches, exhibit weak coupling. This crucial insight underscores the importance of controlled trench formation in unlocking various functionalities of CTPs for use in sensing, catalysis, and energy conversion applications. The controlled manipulation of interconnects in Al nanocrosses thus emerges as a promising avenue for advancing the device performance in these fields.
精确控制电荷转移途径对于释放电荷转移等离子体（CTP）的全部潜力并探索其多样应用至关重要。我们表明，对石墨烯上铝纳米十字结构中的结进行有意操控会引发不对称性，从而开启意想不到的电荷转移途径，并促进耦合谐振器的产生。由聚焦电子束辐照促进形成纳米沟槽所引发的结不对称性，提供了一种实现精确且可控互连操控的通用方法。我们发现，调整纳米十字结构中纳米沟槽的尺寸能够对电荷转移速度和CTP的能量进行定制调制。此外，在我们具有纳米沟槽的实验性纳米十字结构中激发的CTP表现出弱耦合。这一关键见解凸显了可控沟槽形成对于释放CTP在传感、催化和能量转换应用中的各种功能的重要性。因此，对铝纳米十字结构中互连的可控操控成为提升这些领域器件性能的一条有前景的途径。
