The interaction between light and matter induces various optical phenomena such as the weak coupling, which includes surface enhanced infrared absorption (SEIRA) and Fano resonance, as well as the strong-coupling manifested by wavelength splitting at the resonance. Last decade, advances in control of localized surface plasmon resonance have enabled tailoring the lightmatter interaction through a well-defined structural (size, shape, pattern) definition. It made possible to expand research fields developed for optical wavelengths into UV as well as infrared (IR) and terahertz frequencies (sub-mm wavelengths). In particular, the use of plasmon resonance in the mid-IR wavelengths range has attracted much attention in recent years. Although SEIRA was studied earlier in 1980s using rough metal surfaces, it has recently received renewed attention with well controlled nano/micro composite structures . SEIRA based on metal hole array structures was applied to non-dispersive IR (NDIR) gas sensors . Recently, metal-insulator-metal (MIM) plasmonic patterns schemat-ically shown in Fig. , the so called light-absorbing metasurfaces, are increasingly studied for sensor applications. It is possible to apply them to realise mid-IR light sources and detectors based on reciprocity of the Kirchhoff's law of thermal radiation .