拉曼增强型V形槽微结构中的共振增强效应
Resonance enhancement effects in Raman-enhancing pyramid-like V-shape groove microstructures
摘要：
反射表面上的微小金字塔形凹坑，一种类似于后向反射器的几何形状，经常被用来增强信号强度。增强效应通常归因于表面等离子体激元，然而，金字塔3D几何形状的亚波长到近波长尺寸表明来自衍射和近场效应的贡献。我们的理论分析的光强度分布在类似的（但更简单的）2D几何形状假设一个完美的导体屏幕，也就是说，在没有任何等离子体效应，表明在腔内形成的干涉图案导致显着的共振增加局部强度。这种效应对于许多应用，特别是对于广泛使用的拉曼光谱来说是重要的。由于增强的局部场振幅，发射的拉曼信号的无等离子体激元的共振增强也是可能的，这意味着几何形状实际上实现了拉曼激光器。用近场和远场方法获得的衍射图案的比较表明，近场分量是负责所观察到的戏剧性的强度增强，因此拉曼增强以及。
英文摘要：
Microscopic pyramidal pits in a reflective surface, a geometry similar to a retroreflector, are frequently used to enhance signal strength. The enhancement effect is generally attributed to surface plasmons, however, the sub-wavelength to near-wavelength dimensions of the pyramidal 3D geometry suggest contributions from diffraction and near-field effects. Our theoretical analysis of the light intensity distribution in the similar (but simpler) 2D geometry assuming a perfect conductor screen, that is, in the absence of any plasmon effects, shows that interference patterns forming within the cavity cause a significant resonant increase in local intensity. Such effect can be important for many applications, especially for the widely used Raman spectroscopy. Resonant enhancement without plasmons of the emitted Raman signal due to enhanced local field amplitude is also possible, which implies that the geometry practically implements a Raman laser. Comparison of diffraction patterns obtained with near-field and far-field approaches reveals that the near-field component is responsible for the observed dramatic intensity enhancement, and thus the Raman enhancement as well.
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