Fig. 2
From: Plasmonic anapole metamaterial for refractive index sensing
Electromagnetic responses of two components of the plasmonic anapole metamaterial. (a) Schematic diagram of the configuration, (b) transmission (blue curve) and reflection (red curve) spectra, (c) multipole decomposition and phases of electric dipole and toroidal dipole moments, and (d) normalized yz-plane electric field and magnetic field distributions of the dumbbell-perforated gold film placed on the dielectric substrate. The field distribution is extracted from the corresponding resonant wavelength. White dashed arrows depict the orientations of the magnetic field. (e), (f), (g) and (h) Those for the vertical split-ring resonator suspended in a spin on glass layer. Feature sizes: Px = 380 nm, Py = 820 nm, R = 130 nm, Dx = 65 nm, Dy = 60 nm, L = 270 nm, Wx = 60 nm, Wy = 60 nm, H1 = 30 nm, H2 = 55 nm, and thicknesses of the perforated gold film and the spin on glass film are 30 and 135 nm, respectively