  Epsilon near zero modes offer extreme field enhancement that can be utilized
for developing enhanced sensing schemes. However, demonstrations of enhanced
spectroscopies have largely exploited surface polaritons, mostly due to the
challenges of coupling a vibrational transition to volume-confined epsilon near
zero modes. Here we fabricate high aspect ratio gratings (up to 24.8 um height
with greater than 5 {\mu}m pitch) of 4H-SiC, with resonant modes that couple to
transverse magnetic and transverse electric incident fields. These correspond
to metal-insulator-metal waveguide modes propagating downwards into the
substrate. The cavity formed by the finite length of the waveguide allows for
strong absorption of incident infrared light (>80%) with Q factors in excess of
90, including an epsilon near zero waveguide mode with
{\epsilon}eff=0.0574+0.008i. The localization of the electromagnetic fields
within the gap between the grating teeth suggests an opportunity to realize a
new platform for studying vibrational coupling in liquid environments, with
potential opportunities for enhanced spectroscopies. We show that these modes
are supported in anhydrous and aqueous environments, and that high aspect ratio
gratings coherently couple to the vibrational transition in the surrounding
liquid.
