  We have performed calculations of nonlinear optical absorption and nonlinear
optical rectification of an exciton in a nanoring in the presence of the
magnetic flux. Our results show that one can control properties of nonlinear
optical absorption and nonlinear optical rectification of a nanoring by tuning
outer and inner radius. In addition, we also find that nonlinear optical
properties of a nanoring can be modulated by the magnetic flux through
nanoring.
