Fig. 7
From: On-axis structured beams generation via moiré and Mie resonant metallo-dielectric moiré gratings
(a) Simulated transmittivity of Normal Grating NG under various polarizations, inset of the figure show the polarization definitions, (b) electric and magnetic field profiles at a resonant wavelength for Transverse Electric TE and Transverse Magnetic TM polarizations, inset images show the transverse Poynting vector diagram in yz plane where black and white arrows show the circulation and overall direction of transverse Poynting vectors, respectively, and white dotted circles show the saddle type singularity points (c) electric, magnetic and transverse Poyting vector diagrams for metallo-dielectric LFGs of charge 2 and 7 at wavelength 561 nm and 500 nm, (d) wave vector mapping and visual representation of spectral shifts in various orders, (e) experimentally obtained self normalized spectral response of zeroth and first diffraction orders of NG, BFG, and LFG of period 560 nm, (f) self normalized spectral response of LFGs of various periods.
