Appl Opt. 2020 Oct 1;59(28):8856-8865. doi: 10.1364/AO.400765.
A simple dual-core D-shaped plasmonic refractive index (RI) sensor with an open-arch channel is introduced in this paper. A thin plasmonic gold layer is inserted on the slotted portion, which makes the sensor cost effective. By introducing a ring in the flat surface of the D-shaped structure, the coupling effect is increased, which enhances sensor performance. The commonly used finite element method is applied to characterize sensor performance. Numerical investigation under the wavelength interrogation method shows maximum spectral sensitivities of 16,000 nm/RIU and 17,000 nm/RIU along with corresponding resolutions of 6.25×10 and 5.88×10 for and polarizations, respectively. In tandem with this, maximum amplitude sensitivities governed by the amplitude interrogation method are calculated at about 2,603.7000 and 3,432.1929 for and polarizations, respectively. The proposed sensor exhibits high figures of merit of 320 and 283.33 for and polarizations, respectively, in the RI detection range of 1.33 to 1.44. Moreover, the impact on sensitivity with the overall sensor behavior is analyzed by altering geometrical parameters such as pitch, air hole diameter, and gold layer thickness. So, with an eye toward sensor performance and economic viability, this sensor is assignable to bio-sensing applications.
本文提出了一种简单的双芯 D 形等离子体折射率（RI）传感器，具有开口拱道。在开槽部分插入了一层薄的等离子体金层，使传感器具有成本效益。通过在 D 形结构的平面内引入一个环，增加了耦合效应，从而提高了传感器的性能。本文采用常用的有限元法来表征传感器的性能。波长检测方法下的数值研究表明，对于 和 偏振，最大光谱灵敏度分别为 16000nm/RIU 和 17000nm/RIU，相应的分辨率分别为 6.25×10 和 5.88×10。此外，基于幅度检测方法，最大幅度灵敏度约为 2603.7000 和 3432.1929，分别对应于 和 偏振。在 RI 检测范围为 1.33 至 1.44 时，该传感器在 和 偏振下的品质因数分别高达 320 和 283.33。此外，通过改变节距、空气孔直径和金层厚度等几何参数，分析了整体传感器行为对灵敏度的影响。因此，考虑到传感器性能和经济可行性，这种传感器可用于生物传感应用。
