This paper investigates the enhancing plasmonic effect of periodic arrays of silver-shell square prisms employing a three-dimensional finite element method for refractive index and temperature sensing applications in the near-infrared region. We found that the connected metal-shell square prisms could simultaneously generate surface, gap, and cavity plasmon resonances modes in a single structure and remarkably enhance the sensing performance. The proposed design, constructed using silver-shell square prisms with linked fences, as a plasmon resonance source in the center of the unit cell, can sense refractive index and temperature with outstanding sensitivity as 940 nm/RIU and 0.5 nm/°C, respectively. Simulation results reveal that the proposed structure’s absorptance is approximately perfect, significantly larger than its concrete counterpart without the center cavity and linked fences. The proposed system has a strong dipolar effect generated from the mutual inductance on metal and coupled fences, and the capacitive coupling in cavity regions of nanostructures. These distinctive advantages enable the linkage-based plasmonic sensor, a multi-functional biosensor, and a potential label-free photonic device.

本文利用三维有限元方法研究了银壳方棱镜周期阵列在近红外区域的折射率和温度传感的增强等离激元效应。我们发现，连接的金属壳方棱镜可以在单个结构中同时生成表面，间隙和腔等离振子共振模式，并显着提高了感测性能。所提出的设计是使用带有链接围栏的银壳方棱镜作为单位单元中心的等离子激元共振源构建的，可以感测折射率和温度，灵敏度分别高达940 nm / RIU和0.5 nm /°C。 。仿真结果表明，所提出的结构的吸收率近似完美，明显比没有中心腔和链接围栏的混凝土大。所提出的系统具有很强的偶极效应，这是由金属和耦合栅栏上的互感以及纳米结构的空腔区域中的电容耦合产生的。这些独特的优势使基于链接的等离子体传感器，多功能生物传感器和潜在的无标记光子设备成为可能。