  In this manuscript, we have demonstrated that the antenna-enhanced infrared
vibrational spectroscopy can be a powerful platform for high-sensitivity
detection of ultrathin layer of polymer molecules and in situ monitoring of
their crosslinking reaction as well as their kinetics of network formation. Our
precisely designed dual-band perfect absorber (DPA) made of singles-sized
resonator array shows strongly-enhanced nearfield intensity and polarization
independence, providing a powerful antenna platform for the bond-selective
vibrational sensing.
