论文标题
剥削定向的野外投影仪在等离子体纳米颗粒阵列中打开拓扑间隙
Exploiting oriented field projectors to open topological gaps in plasmonic nanoparticle arrays
论文作者
论文摘要
在过去的几年中，纳米光子学中有多个建议，以模仿拓扑凝结物质系统。但是，纳米颗粒具有原子缺乏的自由度，例如尺寸或形状，可以利用这些自由度来探索电子产品以外的拓扑。伸长的纳米颗粒可以像电场的投影仪一样在主要轴的方向上起作用。然后，通过将它们定向在数组中，可以调节它们之间的耦合，从而在原本无间隙的系统中打开差距。为了证明将纳米颗粒定向用于拓扑的潜力，我们研究了pr酸球形银纳米颗粒的1D链。我们表明，在这些阵列中，极化的空间调制可以打开间隙，工程师隐藏的晶体对称性，并根据入射电场的极化开机/关闭或左/右边状态打开/关闭/左/右边状态。这为利用纳米颗粒的特征以使拓扑的特征开辟了道路，以超越凝结物质系统的类似物。
In the last years there have been multiple proposals in nanophotonics to mimic topological condensed matter systems. However, nanoparticles have degrees of freedom that atoms lack of, like dimensions or shape, which can be exploited to explore topology beyond electronics. Elongated nanoparticles can act like projectors of the electric field in the direction of the major axis. Then, by orienting them in an array the coupling between them can be tuned, allowing to open a gap in an otherwise gapless system. As a proof of the potential of the use of orientation of nanoparticles for topology, we study 1D chains of prolate spheroidal silver nanoparticles. We show that in these arrays spatial modulation of the polarization allows to open gaps, engineer hidden crystalline symmetries and to switch on/off or left/right edge states depending on the polarization of the incident electric field. This opens a path towards exploiting features of nanoparticles for topology to go beyond analogues of condensed matter systems.
