Petrov Nikolai I, Danilov Viktor A, Popov Vladimir V, Usievich Boris A
Opt Express. 2020 Mar 2;28(5):7552-7564. doi: 10.1364/OE.386472.
Diffraction of light of a visible spectral range by subwavelength metal gratings has been investigated experimentally and theoretically using rigorous electromagnetic calculations. It has been demonstrated that an effect of surface plasmon resonance (SPR), at which total absorption of light by metal grating can be observed, occurs under certain conditions. Large positive and negative Goos-Hänchen (GH) shifts occur near the SPR. It has been shown that the reflected beam is split into two parts, the relative powers of which depend on the incident beam width and the grating depth. The dependence of the GH shifts on the grating period and grating depth has been investigated for different incident beam widths. The high sensitivity of the GH shift on the incident angle of a light beam near the SPR has been demonstrated.
利用严格的电磁计算，对亚波长金属光栅对可见光谱范围内光的衍射进行了实验和理论研究。结果表明，在一定条件下会出现表面等离子体共振（SPR）效应，此时可观察到金属光栅对光的全吸收。在SPR附近会出现较大的正和负古斯-汉欣（GH）位移。结果表明，反射光束被分成两部分，其相对功率取决于入射光束宽度和光栅深度。针对不同的入射光束宽度，研究了GH位移对光栅周期和光栅深度的依赖性。已证明在SPR附近，GH位移对光束入射角具有高灵敏度。
