Abstract

We study the ultrafast insulator-to-metal transition in nanoparticles of ${\mathrm{VO}}_2$, obtained by ion implantation and self-assembly in silica. The nonmagnetic, strongly correlated compound ${\mathrm{VO}}_2$ undergoes a reversible phase transition, which can be photoinduced on an ultrafast time scale. In the nanoparticles, prompt formation of the metallic state results in the appearance of surface-plasmon resonance. We achieve large, ultrafast enhancement of optical absorption in the near-infrared spectral region that encompasses the wavelength range for optical-fiber communications. One can further tailor the response of the nanoparticles by controlling their shape.

© 2005 Optical Society of America

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