In this research work, a novel highly sensitive refractive index sensor using Au and Ag elliptic-shaped nanoparticles are proposed. The main idea of this work is using an original elliptic-disk nanoparticle that, in constant volume, is decomposed into two particles as a form of smaller elliptic-disk up elliptic-ring to improve the sensitivity. The better optical sensing properties of the proposed nanostructure are the main factor before considering their details. The optimum arrangement is found to have strong vertical coupling, and hence a high sensitivity. A plasmonic resonance peak takes place for the new nanostructure. The sensitivity of 320 nm/RIU and full width at half maximum (FWHM) of 66.5 nm is obtained for Au elliptic-disk nanoparticles. It is important to mention that these values are 260 nm/RIU and 57.3 nm for Au circular-disk nanoparticles, respectively. By decomposing the Au elliptic-disk as a form of elliptic-disk up elliptic-ring, the sensitivity is increased to higher than 440 nm/RIU. Also, the FWHM of the detector is 55.3 nm, and its figure of merit (sensitivity/FWHM) is 7.95. A nanostructure of Ag shows a sensitivity of 416.6 nm/RIU. Its FWHM and FOM are 51.1 nm and 8.15, respectively. The arrangement of decomposed nanoparticles causes the field to be remarkably enhanced at their point of coupling.

在这项研究工作中，提出了一种使用Au和Ag椭圆形纳米颗粒的新型高灵敏度折射率传感器。这项工作的主要思想是使用原始的椭圆盘纳米颗粒，该颗粒以恒定的体积分解为两个颗粒，形式为较小的椭圆盘向上的椭圆环，以提高灵敏度。在考虑细节之前，建议的纳米结构的更好的光学传感特性是主要因素。发现最佳布置具有强的垂直耦合，因此具有高灵敏度。对于新的纳米结构，发生等离子体共振峰。对于Au椭圆盘纳米颗粒，其灵敏度为320 nm / RIU，半峰全宽（FWHM）为66.5 nm。重要的是要提到这些值是260 nm / RIU和57。Au圆盘纳米颗粒分别为3 nm。通过将Au椭圆盘分解为椭圆环上的椭圆环形式，灵敏度提高到高于440 nm / RIU。而且，检测器的FWHM为55.3 nm，并且品质因数（灵敏度/ FWHM）为7.95。Ag的纳米结构显示出416.6nm / RIU的灵敏度。它的FWHM和FOM分别为51.1 nm和8.15。分解的纳米粒子的排列使电场在其耦合点处得到显着增强。15，分别。分解的纳米粒子的排列使电场在其耦合点处得到显着增强。15，分别。分解的纳米粒子的排列使电场在其耦合点处得到显着增强。