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Transmission Resonances by Combined Effects of Fabry-Perot and Surface Plasmons in the THz Region of Metallic Gratings

To study transmission resonances in periodic metal arrays of slits, we used the THz time domain spectroscopy system wih high power THz sources. The resonance peaks of zero-order transmission spectra are attributed to the combined effects of Fabry -Perot and surface plasmon resonances. Fabry-Perot effect enhances the transmission when two resonances cross but does not alter the surface plasmon peak positions. These results are in agreement with theoretical calculations.