Figure 1

(a) BSW excitation is performed in the Kretschmann configuration using a BK7-glass prism. θ is the incident angle, k is the wave vector of the incident beam, β is the wave vector of the BSW and h is the distance between the surface photonic components and the coupling spot. The SNOM probe collects light in the near-field on top of the 2D structures, whereas the CCD camera measures light reflected in the far-field. The inset shows that the platform consists of six layers of silicon nitride (263 nm, n=1.79) and silicon dioxide (492 nm, n=1.45) and a top layer of silicon nitride (80 nm). The 2D photonic components are produced from photoresist coated on the platform. (b) Measured electric field amplitude for TE and TM polarizations at the coupling zone as a function of the propagation distance. (c) Decay length L obtained by fitting the field amplitude of the propagating BSW. BSW, Bloch surface wave; 2D, two-dimensional; SNOM, scanning near-field optical microscope; TE, transverse electric; TM, transverse magnetic.