In this paper, the design and simulation of a single layer meta-surface filter, having the simple geometry, has been demonstrated. The filter is made up of sub-wavelength metallic slot apertures which are periodic in a two dimensions, essentially forming a meta-surface. The filter is realized by fabricating the apertures using micro structured gold film on an ultra-thin silicon nitride substrate. Since, the substrate thickness is much smaller than the free space wavelength of the incident electromagnetic wave so there are no unwanted Fabry-Perot resonances which are inescapable in thick substrates. Ultra-thin substrate also facilitates achieving higher transmitted amplitude because of extremely low dielectric loss. The design of the filter was analyzed using finite element method (FEM) and was optimized for attaining the better out of band attenuation. Insertion loss of less than 0.5 dB has been achieved in the numerical simulation at the resonant frequency of the 1 THz.
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