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X-shaped quasi-3D plasmonic nanostructure arrays for enhancing electric field and Raman scattering

机译：用于增强电场和拉曼散射的X形准3D等离子体纳米结构阵列

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摘要

We propose and demonstrate strongly enhancing electric field and Raman scattering with a large tolerance to the light incident angle and polarization by using x-shaped quasi-3D plasmonic nanostructure arrays (X-Q3D-PNAs). The finite-difference time-domain simulations were used to study the reflectance spectra and electric field profiles of X-Q3D-PNAs. Results show that both surface plasmon polaritons and localized surface plasmon polaritons (LSPPs) can be generated at the metal/dielectric interfaces of the top gold thin film with square grating x-shaped nanoholes. The resonance of the LSPPs generated at the gold islands formed between x-shaped nanoholes at the top gold thin film greatly enhance the electric fields at the tips of the cross-sectors of the x-shaped nanoholes. Both plasmon resonances and electric field enhancements are affected by the structural dimensions. The strong electric field enhancement and the large tolerance to the laser polarization were demonstrated by surface-enhanced Raman scattering experiments. This unique plasmonic property of X-Q3D-PNAs could be attractive for photovoltaics and biosensing applications.
机译：我们提出并证明了通过使用x形准3D等离子体纳米结构阵列（X-Q3D-PNAs），可以增强电场和拉曼散射，并具有对光入射角和偏振的大容忍度。有限差分时域仿真被用来研究X-Q3D-PNAs的反射光谱和电场分布。结果表明，在具有方形光栅x形纳米孔的顶部金薄膜的金属/介电界面上均可以产生表面等离激元极化子和局部表面等离激元极化子。在顶部金薄膜的x形纳米孔之间形成的金岛上产生的LSPPs的共振大大增强了x形纳米孔的横截面尖端处的电场。等离子体激元共振和电场增强都受到结构尺寸的影响。表面增强的拉曼散射实验证明了强电场增强和对激光偏振的大耐受性。 X-Q3D-PNA的这种独特的等离子体特性对于光伏和生物传感应用可能具有吸引力。

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