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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Available from: Lynn Boatner, Oct 10, 2015
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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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    ABSTRACT: Ultrafast spectroscopy is an emerging technique with great promise in the study of quantum materials, as it makes it possible to track similarities and correlations that are not evident near equilibrium. Thus far, however, the way in which these processes modify the electron self-energy-a fundamental quantity describing many-body interactions in a material-has been little discussed. Here we use time- and angle-resolved photoemission to directly measure the ultrafast response of self-energy to near-infrared photoexcitation in high-temperature cuprate superconductor. Below the critical temperature of the superconductor, ultrafast excitations trigger a synchronous decrease of electron self-energy and superconducting gap, culminating in a saturation in the weakening of electron-boson coupling when the superconducting gap is fully quenched. In contrast, electron-boson coupling is unresponsive to ultrafast excitations above the critical temperature of the superconductor and in the metallic state of a related material. These findings open a new pathway for studying transient self-energy and correlation effects in solids.
    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.
    IEEE Journal of Selected Topics in Quantum Electronics 11/2009; 15(5-15):1515 - 1520. DOI:10.1109/JSTQE.2009.2016983 · 2.83 Impact Factor
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    • "As the frequency,  of the applied field drops below ~ 0.4eV [8] diverse behaviours arise with structure and doping. The phase change in VO 2 can also be made to occur very quickly [9] [10] which indicates ionic movement is playing a secondary role in the phase transition and electron-electron or electron-hole interactions are dominating. "
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    ABSTRACT: Thin films of VO2 doped with aluminium, or with nanoscale grain sizes, have been produced. They display semiconductor resistive behaviour above the transition temperature Tc, but a metallic and plasmonic optical response. All samples optically switch over almost identical large ranges at the transition, but have quite variable resistive switching. At fixed grain size a rigorous new quantitative correlation is found between semiconductor resistivity below Tc and the activation energy above Tc as Al doping level varies. Large crystals doped with Al also display this dual behaviour. A possible mechanism is discussed involving fast local fluctuations on neighbouring V4+ ions involving transient dimers with no net spin. Such fluctuations would then need to interact and correlate their motion over the scale of a nanograin within the lifetime of the dimer excitation.
    Journal of Physics D Applied Physics 01/2008; 41(1). DOI:10.1088/0022-3727/41/1/015402 · 2.72 Impact Factor
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