  Enhancing light-matter interaction by exciting Dirac plasmons on
nanopatterned monolayer graphene is an efficient route to achieve high infrared
absorption. Here, we designed and fabricated the hexagonal planar arrays of
nanohole and nanodisk with and without optical cavity to excite Dirac plasmons
on the patterned graphene and investigated the role of plasmon lifetime,
extinction cross-section, incident light polarization, the angle of incident of
light and pattern dimensions on the light absorption spectra.
