Control over extraordinarily narrow spectral bandwidth thermal radiation absorption and emission, with a quality factor of Q ≥ 90, is demonstrated by exploiting weak and strong coupling of molecular vibrational modes with a plasmon resonance supported by a MIM metamaterial. Reciprocity between absorption and emission strength and spectral line-shapes is in accordance with the Kirchhoff's law. The thermal radiation emission spectral features exhibit nearly the same widths as the molecular vibrational modes they were derived from. The uniformity of angle-resolved radiation pattern, its narrow spectral signatures and radiation intensity are all highly compatible with sensing applications. This metamaterial IR radiation source exhibits properties superior compared to alternative grating-based thermal radiation emitter surfaces. Polyimide is among the most thermally stable polymer materials, however, thermal radiance could be enhanced further if polymer materials that can maintain their properties at even higher temperatures can be utilized. Recent advances in production of high-temperature stable polymers culminated with a variety of polyimde stable up to 500 • C 38 . Most polymeric materials exhibit IR absorption in the 4 to 6 µm spectral region, located around the MIR transmittance window of air. Hence, in principle, their metal-polymer composites can be harnessed towards applications in radiative cooling. Furthermore, narrowband emission spectral fingerprint can be tuned by specifically selecting molecular compounds with particular vibrational mode sets. Alternatively, plasmon enhancement can be applied not only to organic materials but to inherently robust inorganic materials such as SiO 2 , SiC and other thermally stable materials .