The exposed and buried gratings of gold (Au) have been simulated to investigate the excitation of surface plasmon polaritons (SPPs) using COMSOL multi-physics-RF module for their application in sensing industry. While investigating the geometrical parameters of grating, the period of the grating structure (i.e. 700 nm) as well as the thickness of grating film (50 nm) was held constant when slit width has been optimized as 500 and 100 nm for exposed and buried grating, respectively. The normal transmission spectra have been used to evaluate the dip indicating resonance wavelength in transmission as well as reflection spectra. The buried grating device found to be a more efficient sensing device, having a sensitivity of 716 nm/RIU, as compared to the exposed grating device with a sensitivity of 674 nm/RIU which reveals the fact that the buried grating offers less scattering to the excited Surface Plasmon Polariton on the grating structure. It is highly fascinating to report that, in the case of buried grating, the sensitivity of the device is increased, and it leads to reduction of the scattering of the surface plasmon polaritons (SPPs). Such a buried structure is novel in sense of nano-grating, hence easier to fabricate finding application as efficient sensors.

已对暴露和掩埋的金 (Au) 光栅进行了模拟，以研究使用 COMSOL 多物理场射频模块激发表面等离子体激元 (SPP) 在传感行业中的应用。在研究光栅的几何参数时，当狭缝宽度优化为 500 和 100 nm 时，光栅结构的周期（即 700 nm）和光栅薄膜的厚度（50 nm）保持不变，用于暴露和掩埋光栅， 分别。正常透射光谱已用于评估指示透射和反射光谱中的共振波长的倾角。埋入式光栅装置被发现是一种更有效的传感装置，具有 716 nm/RIU 的灵敏度，与灵敏度为 674 nm/RIU 的暴露光栅器件相比，这表明掩埋光栅对光栅结构上的激发表面等离子体激元的散射较少。令人着迷的是，在掩埋光栅的情况下，器件的灵敏度提高了，并导致表面等离子体激元 (SPP) 的散射减少。这种掩埋结构在纳米光栅的意义上是新颖的，因此更容易制造找到作为高效传感器的应用。