Figure 4
From: Manipulating Bloch surface waves in 2D: a platform concept-based flat lens
(a) FDTD simulation of the focal distance as a function of the refractive index contrast for the simplified 2D lens and the 3D lens model without a waveguide. The inset shows the focal distance of the 2D lens appended to a 50 µm-long waveguide. (b) Simulations of Δf/fg as a function of the refractive index contrast. (c) Simulated near-field intensity enhancement of the 2D lens appended to a 50 µm-long waveguide. The results are normalized by the incident beam at the first interface of the lens. (d) Cross-section of the measured intensity at the focal spot of the 2D lens appended to a 50 µm-long waveguide, corresponding to the line marked in Figure 3c. 2D, two-dimensional; 3D, three-dimensional; FDTD, finite-difference time-domain.
