  Motivated by increased interest in experiments in which light appears to
propagate by tunnelling at superluminal velocity, the Lorentz invariant theory
proposed by Partha Ghose to explain these surprising effects is revisited. This
theory is based on the Harish-Chandra formalism, which describes the
relativistic dynamics of a massless spin-1 boson, like a photon. Via this
formalism, the Bohmian average transport velocity of the electromagnetic energy
is formulated. It is proved that, if the dielectric making the waveguide is
nonabsorptive and nondispersive, this velocity can be superluminal. This result
is validated in the framework of quantum electrodynamics, demonstrating that
the average velocity of the photon inside the waveguide is given by the
contribution of instantaneous superluminal velocities. This theory, therefore,
suggests the optimal conditions for designing optical devices capable of
locally transporting electromagnetic energy at superluminal velocities
mitigating the signal attenuation.
