  We investigate the effect of superradiance shielding for the analogue
rotating black holes simulated by optical vortices by calculating the radial
motion of massless particles in such spacetime background. We add the
conditions $E<L\Omega_{r_{e}}$ and $L>0$ to judge the classically forbidden
region of superradiance. It is found that the superradiance forbidden region
exists near the static limit inside the ergosphere,which will limit the
classical Penrose process for the particles with some specific energies and
angular momenta. Once these particles satisfying the superradiance conditions
aremeasured at the outside of the ergosphere, this shows that the Penrose
process can be quantum.
