Publications by Andrea Cavalleri

Photoinduced phase transition in VO2 nanocrystals: ultrafast control of surface-plasmon resonance.

Opt Lett 30 (2005) 558-560

M Rini, A Cavalleri, RW Schoenlein, R López, LC Feldman, RF Haglund, LA Boatner, TE Haynes

We study the ultrafast insulator-to-metal transition in nanoparticles of VO2, obtained by ion implantation and self-assembly in silica. The nonmagnetic, strongly correlated compound VO2 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.

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