The optical properties of VO<sub>2</sub> nanoparticles formed in an amorphous SiO<sub>2</sub> host by stoichiometric ion implantation of vanadium and oxygen and thermal annealing have been determined and correlated with the particle size and morphology. The results show that that the temperature-controlled semiconductor-to-metal phase transition of the VO<sub>2</sub> nanophase precipitates turns on the classical surface plasmon resonance, with specific features that depend on the size and aspect ratio of the VO<sub>2</sub> particles. This effect improves the optical contrast between the metallic and semiconducting states in the near-IR region of the spectrum as a result of dielectric confinement that is due to the SiO<sub>2</sub> host. A fiber-optic application is demonstrated, as is the ability to control the characteristics of the phase transition by using ion implantation to dope the VO<sub>2</sub> nanoparticles with tungsten or titanium ions.
© 2002 Optical Society of America
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(130.6010) Integrated optics : Sensors
(160.6840) Materials : Thermo-optical materials
(350.4990) Other areas of optics : Particles
R. Lopez, T. E. Haynes, L. A. Boatner, L. C. Feldman, and R. F. Haglund, Jr., "Temperature-controlled surface plasmon resonance in VO 2 nanorods," Opt. Lett. 27, 1327-1329 (2002)