Absorption and scattering of infrared radiation by vanadium dioxide nanoparticles with a metallic shell

The numerical simulation of the absorption and scattering cross sections of vanadium dioxide nanoparticles with silver and gold shells are presented. The cross sections are evaluated for the spectral intervals 1-1.2, 1.3-1.7, and 9-12 mum both before and after the semiconductor-metal phase transition in VO2 . It is demonstrated that the transition of VO2 to the metallic state near (or away from) plasmon resonances leads to a decrease (or increase) in the absorption and scattering cross sections for a given wavelength. The decrease is related to the shift of the plasmon resonance band, whereas the increase is directly related to the growth of the VO2 absorption upon the phase transition. (C) 2003 MAIK "Nauka/Interperiodica".