Vanadium dioxide (VO2) is an interesting electron material that exhibits a reversible first-order phase transition from a low temperature insulating state to a high temperature metallic state at a critical temperature nearly 340K.[1-3] Associated with this metal-insulator transition (MIT) are a lattice structural transition from the monoclinic to tetragonal,a change of conductivity by several orders of magnitude,and significant changes of the optical properties at all wavelengths.