Grimmer Maximilian, Tao Wei, Fleischer Monika
Opt Express. 2024 Jan 15;32(2):1926-1940. doi: 10.1364/OE.506942.
In this paper we investigate the Fano resonances of a ring-disc nanostructure that consists of two nanodiscs and two concentric nanorings. The dark modes of both nanorings can couple to the bright mode of the nanodiscs, leading to separate Fano resonances from the outer and the inner nanoring. The concentric arrangement of the two nanorings allows for a coupling between the dark modes of the outer and the inner nanoring, thus creating an additional interaction that influences the Fano resonances of the dual-ring nanostructure. This interaction is investigated by comparing the Fano resonances of the complete dual-ring structure with the isolated Fano resonances of the individual single-ring structures. The effect of the coupling between dark modes on the Fano resonances is verified using a model of coupled harmonic oscillators that describe the Fano resonances of this system in a classical analogy. Lastly we compare the sensitivity of a single-ring nanostructure with that of a dual-ring nanostructure to investigate the effects of a coupling between dark modes on the sensing performance.
在本文中，我们研究了一种由两个纳米盘和两个同心纳米环组成的环形盘纳米结构的法诺共振。两个纳米环的暗模式都可以与纳米盘的亮模式耦合，从而导致来自外纳米环和内纳米环的独立法诺共振。两个纳米环的同心排列允许外纳米环和内纳米环的暗模式之间发生耦合，从而产生一种额外的相互作用，这种相互作用会影响双环纳米结构的法诺共振。通过将完整双环结构的法诺共振与单个单环结构的孤立法诺共振进行比较来研究这种相互作用。使用耦合谐振子模型验证了暗模式之间的耦合对法诺共振的影响，该模型以经典类比的方式描述了该系统的法诺共振。最后，我们比较了单环纳米结构和双环纳米结构的灵敏度，以研究暗模式之间的耦合对传感性能的影响。
