Fig. 1: Schematic of the studied 1D-photonic crystal structure and transmission properties.
From: Correcting the formalism governing Bloch Surface Waves excited by 3D Gaussian beams
a The incident beam illuminates the structure from a glass substrate at an angle θm. It is linearly polarized along the y-direction (Transverse Electric polarization). The bilayer stack is composed of a layer of high-index media (nh = 2.23) with a thickness dh = 294 nm deposited on a second layer made in low-index material (nl = 1.75) of thickness dl = 240 nm. The total number of stacks is named N and the structure is terminated by a top layer of high-index material of dtop = 5503 thickness. b Transmitted electric intensity in logarithmic scale versus the number of bilayers N. Additional modes H1, H2, and H3 occur when N increases corresponding to smaller values of the angle of incidence. c Variations of θBSW as a function of the number of bilayers (N) in blue solid line and its Full Width to Half Maximum (FWHM) variation Δθ (in log-scale) in red dashed line. d Variations of the quality factor Q of the Bloch Surface Wave excitation with the bilayer number N for different values of the optical refractive index imaginary part n″.
