Abstract The intent of this paper is to design of a nanoantenna with Fano response, by using a split ring resonator (SRR) element as a refractive index sensor in the range of 2 – 4 μ m for the infrared spectrum. A few organic material particles are implanted inside of the gaps which are made by the gold layers so that using organic materials conduce to the switchable characteristic in this nanoantenna. The gaps play a fundamental role to control the electric field and create hot spots at the center of the proposed nanoantenna. The primary antenna shows Fano response at 2450 nm and 3100 nm and the parasitic elements are added to this primary nanoantenna. The parasitic elements are important to control the electric fields in hot spots and change the shape of Fano response in the second nanoantenna. The extinction cross-section (ECS) and the electric field of the antenna are compared for both “On” and “Off” modes of the switches. It shows the organic material particles’ conductivity can be noticed to design a switchable nanoantenna thereby it is suitable to be exploited as an optical sensor. The sensitivity of both suggested structures is obtained from frequency shift and ECS change with a maximum value of 420 nm/RIU and 4.93 × 10 5 nm 2 /RIU.

中文翻译：

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一种以有机材料复合材料作为折射率传感器的可切换裂环谐振器纳米天线设计

摘要 本文的目的是设计具有 Fano 响应的纳米天线，通过使用裂环谐振器 (SRR) 元件作为红外光谱范围为 2 – 4 μ m 的折射率传感器。一些有机材料颗粒被植入由金层制成的间隙内，因此使用有机材料有助于该纳米天线的可切换特性。间隙在控制电场和在提议的纳米天线中心产生热点方面起着基本作用。主天线在 2450 nm 和 3100 nm 处显示 Fano 响应，寄生元素被添加到这个主纳米天线。寄生元件对于控制热点中的电场和改变第二个纳米天线中 Fano 响应的形状很重要。比较开关的“开”和“关”模式的消光截面 (ECS) 和天线电场。它表明可以注意到有机材料颗粒的导电性来设计可切换的纳米天线，因此适合用作光学传感器。两种建议结构的灵敏度是从频移和 ECS 变化获得的，最大值为 420 nm/RIU 和 4.93 × 10 5 nm 2 /RIU。