To realize even more spectrally narrow thermal radiation emitters it is important to investigate in detail the coupling between plasmon resonance and the molecular vibrational modes. Despite their disparate and complex physical origins, both the plasmon resonances supported by MIM metasurfaces as well as molecular absorption modes can be reasonably well approximated using the Lorenz oscillator model. If the two resonances have a good overlap both spatially and spectrally, the so called "strong coupling" conditions can be realised. Their characteristic feature is mode splitting into higher and lower energy branches that becomes apparent in dispersion spectra. Most of these strong coupling phenomena have been observed for J-aggregate dye molecules such as porphyrine and rhodamine, which have a high dipole moment in the aggregated form. In the same way, polymer materials are expected to have a relatively directional polymer chain which is favorable for realisation of larger dipole moments.