倾斜入射光通过亚波长金属狭缝的漏斗效应。

Funneling of Oblique Incident Light through Subwavelength Metallic Slits.

作者信息

Chen Alex E, Xia Xue-Qun, Hong Jian-Shiung, Chen Kuan-Ren

机构信息

Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan.

School of Electrical Engineering and Computer Science, The Pennsylvania State University, State College, PA 16802, USA.

出版信息

Nanomaterials (Basel). 2022 Dec 23;13(1):61. doi: 10.3390/nano13010061.

DOI:10.3390/nano13010061

PMID:36615971

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9824441/

Abstract

Light funneling determines how enhanced energy flows into subwavelength slits. In contrast to the previous research on oblique incident light, this study reveals that light funneling in the slits can be highly asymmetric, even at small angles. This mechanism is explained by polarized fields and charges, which are induced using Poynting vectors. It is shown that when light is obliquely incident to the slits perforated in a perfect electric conductor, asymmetrical fields and charges accumulate at the upper apex corners of the left (right) sides. When light is incident from the left (right) side, more (less) induced fields and charges accumulate in the left (right) slit corner so that the funneling width, area, and energy flow at the left (right) side increases (decreases).

摘要

光漏斗效应决定了增强的能量如何流入亚波长狭缝。与之前关于斜入射光的研究不同，本研究表明，即使在小角度下，狭缝中的光漏斗效应也可能高度不对称。这种机制可以通过极化场和电荷来解释，它们是利用坡印廷矢量感应产生的。研究表明，当光斜入射到完美电导体上的狭缝时，不对称的场和电荷会聚集在左侧（右侧）的上顶角处。当光从左侧（右侧）入射时，更多（更少）的感应场和电荷会聚集在左侧（右侧）狭缝角，从而使左侧（右侧）的漏斗宽度、面积和能量流增加（减少）。