Liu Haitao, Lalanne Philippe
Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China.
Opt Express. 2013 Jul 15;21(14):16753-62. doi: 10.1364/OE.21.016753.
Under light illumination, metallic gratings present unexpected and fascinating phenomena, which are due to the complex charge patterns generated on the grating surfaces. The moving electrons are due to the launching of surface plasmon polaritons (SPPs), but only in part. We derive analytical expressions quantifying the plasmonic character of the surface charge patterns, i.e. the contribution of SPPs to its formation. The expressions have a general significance, in the sense that they may be applied to a variety of geometries and spectral ranges, irrespective of whether the grating absorbs, transmits, reflects, or how strongly it resonates.
在光照下，金属光栅呈现出意想不到且引人入胜的现象，这是由于光栅表面产生的复杂电荷模式所致。移动的电子部分归因于表面等离激元极化激元（SPP）的激发。我们推导了量化表面电荷模式等离激元特性的解析表达式，即SPP对其形成的贡献。这些表达式具有普遍意义，因为它们可应用于各种几何形状和光谱范围，而不论光栅是吸收、透射、反射，还是其共振强度如何。
