Pors Anders, Nerkararyan Khachatur V, Sahakyan Khachik, Bozhevolnyi Sergey I
Opt Lett. 2016 Jan 15;41(2):242-5. doi: 10.1364/OL.41.000242.
We analytically describe light transmission through a single subwavelength slit in a thin perfect electric conductor screen for the incident polarization being perpendicular to the slit, and derive simple, yet accurate, expressions for the average electric field in the slit and the transmission efficiency. The analytic results are consistent with full-wave numerical calculations and demonstrate that slits of widths ∼100 nm in real metals may feature nonresonant (i.e., broadband) field enhancements of ∼100 and transmission efficiency of ∼10 at infrared or terahertz frequencies, with the associated metasurface-like array of slits becoming transparent to the incident light.
我们通过解析描述了垂直于狭缝的入射偏振光透过薄的理想电导体屏幕上的单个亚波长狭缝的情况，并推导了狭缝中平均电场和传输效率的简单而准确的表达式。解析结果与全波数值计算结果一致，表明在红外或太赫兹频率下，实际金属中宽度约为100 nm的狭缝可能具有约100倍的非共振（即宽带）场增强和约10%的传输效率，且与之相关的类似超表面的狭缝阵列对入射光变得透明。
