Figure 3

(A) Cross-sectional intensity and (B) transmitted electric field intensity |E|2 (5 nm from the aperture exit plane, in air) distributions for a 50 nm diameter circular aperture in a 50 nm gold film (optical properties are taken from [17]) on glass. A y-polarized plane wave at 800 nm illuminates the aperture from the glass side. Simulations are performed using a frequency-domain finite-element method (FEM) solver [18]. (C) A hole array (from [19]) and (D) groove structure (from [20]) used to achieve transmission enhancement.

© De Gruyter