This is a variation of the example for a 1D periodic line grating Line Grating. It is inspired by blazed gratings. As in the case of the 1D line, the periodic unit cell contains the 2D cross-section through the grating. Here the cross-section contains two triangular shapes with different widths, heights and angles. These triangular lines are situated on a substrate and surrounded by a background material. The materials in the example are chosen as chrome (line), glass (substrate) and air (background).
The grating is illuminated by plane waves with and polarization. JCMsuite computes the near field distributions. The following figures show the near-field intensities within the structure for perpendicular plane wave incidence from the substrate side at a wavelength of .
Near field intensity for -polarized illumination
Near field intensity for -polarized illumination
The post process Fourier Transform computes the amplitudes of the transmitted diffraction orders.
Parameter scan
The Matlab® script data_analysis/run_scan_illumination.m provides a scan over the incidence angle at fixed grating height and angle. It produces the following plots showing the intensities for reflected and transmitted diffraction orders:
In the script data_analysis/run_scan_height.m the height of one of the triangular lines is varied from to at a fixed illumination angle. This yields the following height dependencies:
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