Fig. 3: In-plane excitation of a silicon disk from a waveguide.
a Sketch of the in-plane excitation of a silicon disk from a waveguide end. b Electric-field lines at the anapole and c maximum-energy wavelengths under waveguide illumination for a r = 350 nm disk with waveguide width w = 420 nm and gap g = 600 nm, with the system placed on a silica substrate. Scale bar: 300 nm. 3D-FDTD simulations of the normalized out-of-plane scattering (d) and the electric-field intensity ∣Ey∣2 at the disk center (e) for disk radius r varying between 300 and 400 nm (325, 350, and 375 nm in color and the rest in 10 nm steps in gray as visual guide). Normalization is performed by comparing with the same case without the silicon disk
