Efficient finite-element simulation of extra-ordinary transmission of light through sub-wavelength aperture in a corrugated perfectly conducting plane at microwave frequencies

In this work, we show theoretically that extraordinary transmission due to resonant excitation of surface Plasmons is not limited to the optical frequency regime and metals with negative permittivity. Using a highly efficient finite element algorithm based on the surface integral equation, we showed that a PEC slab perforated periodically can couple the surface waves to incident waves at microwave frequencies. This extends the use of the phenomenon of extraordinary transmission to a wide range of applications in the microwave frequencies.