Riccardi Marco, Martin Olivier J F
Opt Express. 2021 Apr 12;29(8):11635-11644. doi: 10.1364/OE.421951.
In this work, we use finite elements simulations to study the far field properties of two plasmonic structures, namely a dipole antenna and a cylinder dimer, connected to a pair of nanorods. We show that electrical, rather than near field, coupling between the modes of these structures results in a characteristic Fano lineshape in the far field spectra. This insight provides a way of tailoring the far field properties of such systems to fit specific applications, especially maintaining the optical properties of plasmonic antennas once they are connected to nanoelectrodes. This work extends the previous understanding of Fano resonances as generated by a simple near field coupling and provides a route to an efficient design of functional plasmonic electrodes.
在这项工作中，我们使用有限元模拟来研究连接到一对纳米棒的两种等离子体结构（即偶极天线和圆柱二聚体）的远场特性。我们表明，这些结构模式之间的电耦合而非近场耦合会在远场光谱中产生特征性的法诺线形。这一见解提供了一种调整此类系统远场特性以适应特定应用的方法，特别是在等离子体天线连接到纳米电极后仍能保持其光学特性。这项工作扩展了之前对由简单近场耦合产生的法诺共振的理解，并为功能性等离子体电极的高效设计提供了一条途径。
