Figure 3
From: Manipulating Bloch surface waves in 2D: a platform concept-based flat lens
(a) Topography of the 100-nm-thick (layer-thickness) planoconvex lens. (b) Schematic of the 2D lens: the BSW propagating on the surface of the platform is focused by an ultrathin PR layer patterned as a planoconvex lens appended to a waveguide. (c) Measured and (d) simulated near-field intensity, showing light propagation through the 2D planoconvex lens. A focused spot is observed 60 µm from the first interface of the lens, and the positions of the 2D planoconvex lens and the attached waveguide are marked by closed solid lines. P indicates the first interface of the lens, F indicates the z position of the maximum intensity of the focal spot and β is the propagation constant of the BSW. The cross-section line in (c) corresponds to the maximum measured intensity position. BSW, Bloch surface wave; 2D, two-dimensional; PR, photoresist.
