The optimization and comparison of different geometrical parameters of metallic nano-gratings that affect the plasmonic bandgap significantly is being reported in the present research work. The optimization and comparison of geometrical parameters of metallic nano-grating has been important subject to the development of plasmonic devices and systems. This study presents the effect of far field reflection spectra of 1D buried and exposed gratings designed in COMSOL on the plasmonic bandgap using the finite element analysis. In this work, we demonstrated various new trends of PBG energy in gold (Au) nano-gratings by controlling slit width, periodicity and film thickness. The variation of incidence angle of p-polarized light is also studied for the angular dependence, which shows corresponding opening of PBG in the dispersion curves.

在本研究工作中，已报告了对影响等离子体带隙的金属纳米光栅的不同几何参数的优化和比较。金属等离子光栅的几何参数的优化和比较已成为等离子体技术和系统发展的重要课题。本研究通过有限元分析，提出了用COMSOL设计的一维掩埋和暴露光栅的远场反射光谱对等离子体带隙的影响。在这项工作中，我们通过控制缝隙宽度，周期性和膜厚，展示了金（Au）纳米光栅中PBG能量的各种新趋势。还研究了p偏振光的入射角的变化与角度的关系，这表明了色散曲线中PBG的相应开口。