Plasmonic Wire Grating (Wave Optics)

Application ID: 14705

In this model, a plane wave is incident on a wire grating on a dielectric substrate. Coefficients for transmission, reflection, and first order diffraction are computed for different angles of incidence

The model is set up for one unit cell of the grating, flanked by Floquet boundary conditions describing the periodicity. As applied, this condition states that the solution on one side of the unit cell equals the solution on the other side multiplied by a complex-valued phase factor. The phase shift between the boundaries is evaluated from the perpendicular component of the wave vector. The periodicity boundaries are parallel with the y-axis, therefore, only the x-component is required. The phase factor is the same for the refracted and reflected beams as for the incident wave due to the continuity of the field.