纳米金属光栅结构的表面等离子滤波器设计

Design of the Surface Plasmon Filter Based on Nano-Metallic Grating

提出了一种纳米金属光栅结构的高灵敏度的表面等离子共振分光滤波器,采用严格耦合波理论分析了横磁波在金属光栅层-介质层的光谱特性,以633 nm作为中心波长入射时,优化后的几何参数分别为二氧化硅介质层d=2.5μm,Ag光栅高度h=10 nm,光栅占空比f=0.35时出现一个深的、窄的和半峰值全宽小于3 nm的锐利透射峰.

A resonance spectral filter of surface plasmon with high sensitivity is designed using nano metal grating structure.The spectroscopic properties of the transverse magnetic wave in the nano-metal grating and dielectric layer are investigated in detail by rigorous coupled-wave theory. Using the wavelength at 633 nm as an incident center wavelength,the optimal parameters of the silica layer d,the silver grating height h and the grating duty cycle f for the proposed structure are 2. 5 um,10 nm and 0. 35,respectively. A deep,narrow and sharp transmission peak is occurred,which full width at half maximum band width is less than 3 nm.