Liu Zhaowei, Durant Stéphane, Lee Hyesog, Xiong Yi, Pikus Yuri, Sun Cheng, Zhang Xiang
NSF Nano-scale Science and Engineering Center, University of California, Berkeley, 94720-1740, USA.
Opt Lett. 2007 Mar 15;32(6):629-31. doi: 10.1364/ol.32.000629.
We have demonstrated a surface plasmon polariton mediated optical Moiré effect by inserting a silver slab between two subwavelength gratings. Enhancement of the evanescent fields by the surface plasmon excitations on the silver slab leads to a remarkable contrast improvement in the Moiré fringes from two subwavelength gratings. Numerical calculations, which agree very well with the experimental observation of evanescent-wave Moiré fringes, elucidate the crucial role of the surface plasmon polaritons. The near-field Moiré effect has potential applications to extend the existing Moiré techniques to subwavelength characterization of nanostructures.
我们通过在两个亚波长光栅之间插入一块银板，展示了表面等离激元极化激元介导的光学莫尔效应。银板上的表面等离激元激发增强了倏逝场，从而显著提高了两个亚波长光栅产生的莫尔条纹的对比度。数值计算与倏逝波莫尔条纹的实验观测结果非常吻合，阐明了表面等离激元极化激元的关键作用。近场莫尔效应在将现有莫尔技术扩展到纳米结构的亚波长表征方面具有潜在应用。
