Transmission and reflection through 1D metallo-dielectric gratings of real metals under sub-wavelength condition

Under the sub-wavelength condition (w<λ/2), an analytical model of light transmission and reflection through 1D metallo-dielectric gratings of real metals has been developed. It has been shown that the transmission intensity associated with the Fabry-Perot (FP) resonance of a 1D metallo-dielectric grating of a real metal decreases with the increasing grating thickness and the dielectric constant of the ridge material. Further, it has been demonstrated that the intensity of the FP resonance increases with the increasing slit width while it is independent of the grating period (P) and the incidence angle (when Pλ). Analytical model developed in this paper can be useful in the design of 1D metallo-dielectric gratings based extraordinary optical transmission devices.