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(Color online) (a) The sketch of the broadband slow-wave system based on graded gratings of finite thickness. (b) The νg of the spoof SPPs on the gratings with w = 2 mm and p = 5 mm. The slot depths vary from h = 4 mm to 12 mm with step 0.001 mm. The thickness D of the grating structure is 10 mm.
(Color online) (a) The photograph of the field mapping experiment setup. (b) Zoomed-in view of the samples in the red dashed line box of (a). (c) The dimensions of the broadband slow-wave system in the microwave frequency.
(Color online) The 2D electric-field distributions at the xz-plane 2 mm above the upper surface of the structure. The left parts are the results obtained from the full-wave simulations. The right parts correspond to experimental results. The slot depths of the left-side grating vary from 4.7mm to 14.9 mm with Δh 1 = 0.3 mm. The slot depths of the right-side grating vary from 5.0 mm to 11.8 mm with Δh 2 = 0.2 mm.
(Color online) The 1D electric-field distributions along the line z = 32 mm. (a)-(d) The full-wave simulation results and measured results at different frequencies.
(Color online) Results obtained from the full-wave simulations. (a)-(d) 2D field distributions on the y = 0 plane; (e) 1D optical-intensity (|E|2) distributions on the line z = 21 μm.
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