Of special note are various electromagnetic energy absober metasurfaces, which represent an intriguing approach to the creation of narrowband thermal radiation sources . For instance, grating structures that allow for ultra-narrow band thermal emission out-coupled at a specific angle have been demonstrated, however, are subject to limitations due to that inherent angular dependence of resonance. On the other hand, plasmonic absorber metasurfaces likewise support spectrally narrow resonance modes, with widths only around 200-600 nm in mid-infrared (MIR) wavelength range, with the added benefit of their angular pattern of radiation being almost angle-independent . Recent trends in narrow-band thermal radiation emitters show Q-factors ranging between 60 and 200 with specific materials/structures. A less than 100 cm -1 bandwidth is required for molecular detection, which is readily satisfied by molecular absorption enhanced using metasurface configurations . The unique merit of using a molecular vibrational mode is the possibility for harnessing its spectral signature for targeted identification of the same molecular functional group, e.g. -OH or -NH and the like.