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Under the sub-wavelength condition ($w<\lambda/2$), an analytical model oflight transmission and reflection through $1$D metallo-dielectric gratings ofreal metals has been developed. It has been shown that the transmissionintensity associated with the Fabry-Perot (FP) resonance of a $1$Dmetallo-dielectric grating of a real metal decreases with the increasinggrating thickness and the dielectric constant of the ridge material. Further,it has also been demonstrated that the intensity of the FP resonance increaseswith the increasing slit width while it is independent of the grating period($P$) and the incidence angle (when $P << \lambda$

Transmission and Reflection through $1$D Metallo-Dielectric Gratings of Real Metals under Sub-wavelength Condition