Rectangular grating surface plasmon interference model equivalent numerical experiment

Based on the Equivalent Current Theory of optical waveguide coupling, the electric field distribution of grating structure and notch groove slit are derived. Beam divergence angle with different grating notch groove and light intensity of non-uniform array antenna structure are numerical simulated. Beam light field background comparison diagram with different notch groove current amplitude and the influence of phase difference on beam peak position are shown. The results show that with the number of grating notch groove becomes larger, beam divergence angle becomes smaller and amplitude larger and beam light fields background darker. In addition, the larger current the grating notch groove is, the darker the background light fields are. With the phase difference increases, the main peak position moves to right. The conclusions above provide theoretical basis for the beam direction modulation and control.