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Metamaterials are patterned metallic structures which permit access to novel electromagnetic responses impossible to achieve with naturally occurring materials. Babinet or “inverse” metamaterials yield the complimentary transmissive or reflective properties compared to metamaterials. On the other-hand, the interaction of light with periodic two dimensional hole arrays in thin metals can lead to enhanced light transmission, greater than that expected based on the hole size to wavelength. We elucidate the relationship between subwavelength aperture arrays and Babinet metamaterials and their relation on surface plasmons in the context of optical constants. Experimental results at terahertz frequencies are presented and supported by simulations.