  We investigated the dimensionality transition behavior of graphene localized
plasmon resonances in confinement-controlled graphene devices. We first
demonstrated a possibility of dimensionality transition, based on the devices
carrier-density dependence, from a two-dimensional plasmon resonance to a
one-dimensional plasmon one. We fabricated optical transparent devices and
electrical transport devices on the same optical transparent wafer. These
devices allow detailed control and analysis between carrier density and plasmon
resonance peak positions. The carrier density from square root n
(two-dimensional) to constant (one-dimensional) is consistent with the
theoretical predictions based on the Dirac Fermion carriers in linear-band
structure materials.
