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

Department of Physics and Astronomy, Vanderbilt University, Нашвилл, Michigan, United States
Optics Letters (Impact Factor: 3.29). 04/2005; 30(5):558-60. DOI: 10.1364/OL.30.000558
Source: PubMed


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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    • "The transition can be triggered by thermal [43], electrical [44], optical [45] and even strong THz fields [46]. The transition speed ranges from several ns for the electrical activation [47] down to the ps and fs regime for the optical-induced transition [45]. "
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    ABSTRACT: A terahertz amplitude switching device is proposed which allows for the efficient manipulation of sharp transmission bands. The switching concept is based on the thermally-triggered insulator–to-metal transition of a thin vanadium dioxide layer, placed inside a Fabry-Pérot resonator.
    IEEE Transactions on Terahertz Science and Technology 08/2015; DOI:10.1109/TTHZ.2015.2478448 · 2.18 Impact Factor
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    • "Strong optical pulses have been used as powerful tools to measure the electron-phonon interaction in solids[1] [2], to investigate fundamental dynamical processes in semiconductors[3] [4], and to modulate the lattice structure of solids by creating dynamical states with new properties[5] [6] [7] [8]. These methods are particularly exciting in the context of correlated materials, where intense optical fields can drive a transition from an insulating to a metastable metallic phase[9], can induce transient signatures of superconductivity[10], can lead to anisotropic modulation of the electron-phonon coupling[11], and can disentangle the different dynamics in governing the superconducting and pseudogap phase of cuprates[12] [13] [14] [15]. "
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    Nature Communications 09/2014; 5:4959. DOI:10.1038/ncomms5959 · 11.47 Impact Factor
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    • "The 1-D nanostructures used in our experiment include vanadium dioxide (VO 2 ) nanowires, vanadium oxyhydroxide (H 2 V 3 O 8 ) nanowires, and titanium dioxide (TiO 2 ) nanotubes. These metal oxide nanostructures are at the center of many emerging applications such as nanophotonics (ultrafast optical shutter [22]) and nanoelectronics (nanoscale FET [23]). These Fig. 4 "
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    ABSTRACT: We report long-range trapping of vanadium dioxide (VO<sub>2</sub>) and vanadium oxyhydroxide (H<sub>2</sub>V<sub>3</sub>O<sub>8</sub>) nanowires at a distance as large as 50 mum outside the laser spot using plasmonic tweezers and controlled rotation of the nanowires by combining trapping with microfluidic drag force. The plasmonic tweezers are built upon a self-assembled gold nanoparticle array platform. In addition to the long-range trapping and rotation capability, the required optical intensity for the plasmonic tweezers to initiate trapping is much lower (8 muW/mum<sup>2</sup>) than that required by conventional optical tweezers for similar nanowires. We also investigate possible mechanisms for the unique long-range trapping of nanowires through performing control experiments.
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