Figure 4: Double-gap split-ring for enhancing E-field in the surrounding environment.
From: All-dielectric metasurface analogue of electromagnetically induced transparency
(a) Diagram of the metasurface. The geometrical parameters are: a2=150 nm, b2=600 nm, rin2=120 nm, rout2=250 nm, g3=70 nm, g4=50 nm, t=110 nm, p3=750 nm and p4=800 nm. (b) Simulated electric-field-amplitude distribution. (c) Scanning electron microscope image of the fabricated metasurface. The inset shows a single unit cell (scale bar, 200 nm). (d) Simulated (blue solid line) and measured (red dashed line) transmittance spectrum of the metasurface.
