TE Polarization Extraordinary Transmission through Metallic Grating with Subwavelength Slits

Based on finite-difference-time-domain method, we have shown that the transmission of TE polarization is affected with the geometrical parameters of one-dimensional metallic grating with subwavelength slits at the wavelength range from visible to near-infrared light. The increase of the dielectric refractive index of slits and the slit width leads to the redshift of the position of the peaks in transmission spectra, but the change of the grating period does not affect that. By tuning the structural geometry, the polarization independent element can be achieved at Communication wavelength.