In this paper, a novel nanoscale refractive index sensor topology, which incorporates a ring resonator containing circular tapered defects coupled to a metal-insulator-metal (MIM) plasmonic waveguide with tapered defects, is proposed. For the proposed design, the effect of introduction of defects on transmittance value, shape of magnetic field, and sensor parameters such as sensitivity (S) and figure of merit (FOM) are investigated numerically and simulated using finite-difference time-domain (FDTD) method. By optimizing the ring radius and selecting the appropriate waveguide width, we have achieved a maximum sensitivity of 1295 nm per refractive index unit (RIU) and a fairly high FOM equal to 159.6 RIU⁻¹. The structure can be used as a high accuracy refractive index sensor for refractive indices ranging from 1 to 1.65. Due to the small size, wide detection range, and the high detection resolution of the proposed sensor, it is a good choice for integrated bio-sensing applications.

在本文中，提出了一种新颖的纳米级折射率传感器拓扑结构，该拓扑结构包含一个环形谐振器，该环形谐振器包含耦合到具有锥形缺陷的金属-绝缘体-金属（MIM）等离子体波导的圆形锥形缺陷。对于拟议的设计，通过有限差分时域（FDTD）数值研究了引入缺陷对透射率值，磁场形状和传感器参数（例如灵敏度（S）和品质因数（FOM））的影响，并进行了模拟。 ） 方法。通过优化环半径并选择合适的波导宽度，我们实现了每个折射率单位（RIU）的最大灵敏度为1295 nm，并且相当高的FOM等于159.6 RIU ^-1。该结构可用作折射率范围为1至1.65的高精度折射率传感器。由于所建议传感器的体积小，检测范围广，检测分辨率高，因此是集成生物传感应用的理想选择。