Now showing items 135-154 of 722

  • Diffractive coupling in gold nanoparticle arrays and the effect of disorder 

    Auguié, Baptiste; Barnes, William L. (Optical Society of America, 2009)
    Two-dimensional arrays of gold nanoparticles with a periodicity commensurate with the wavelength of resonant excitation of localized plasmons have been shown to exhibit a strong long-range interaction between particles. ...
  • Dirac plasmons in bipartite lattices of metallic nanoparticles 

    Sturges, TJ; Woollacott, Claire; Weick, Guillaume; Mariani, Eros (IOP Publishing, 2015-02-12)
    We study theoretically "graphene-like" plasmonic metamaterials constituted by two-dimensional arrays of metallic nanoparticles, including perfect honeycomb structures with and without inversion symmetry, as well as generic ...
  • Dirac-like plasmons in honeycomb lattices of metallic nanoparticles 

    Weick, Guillaume; Woollacott, Claire; Barnes, William L.; Hess, Ortwin; Mariani, Eros (American Physical Society, 2013)
    We consider a two-dimensional honeycomb lattice of metallic nanoparticles, each supporting a localized surface plasmon, and study the quantum properties of the collective plasmons resulting from the near-field dipolar ...
  • Direct excitation of propagating spin waves by focused ultrashort optical pulses 

    Au, Y.; Dvornik, Mykola; Davison, T.; Ahmad, E.; Keatley, Paul Steven; Vansteenkiste, A.; Van Waeyenberge, B.; Kruglyak, V.V. (American Physical Society, 2013)
    An all-optical experiment long utilized to image phonons excited by ultrashort optical pulses has been applied to a magnetic sample. In addition to circular ripples due to surface acoustic waves, we observe an X-shaped ...
  • Direct mapping of surface plasmon dispersion using imaging scatterometry 

    Hibbins, Alastair P.; Constant, Thomas J.; Lethbridge, Alfred J.; Sambles, J. Roy; Stone, Edmund K.; Vukusic, Peter (American Institute of Physics, 2013)
    The iso-frequency contours of diffracted surface plasmons on metallic bigratings have been directly recorded using imaging scatterometry. Metallic rectangular bigratings, formed of two “crossed” surface relief gratings, ...
  • Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots 

    Hendry, Euan; Koeberg, Mattijs; Wang, F.; Zhang, H.; de Mello Donegá, C.; Vanmaekelbergh, D.; Bonn, Mischa (American Physical Society, 2006)
    We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots. Time-resolved luminescence and terahertz spectroscopy reveal that the rate of hole cooling, following photoexcitation ...
  • Direct observation of negative-index microwave surface waves. 

    Dockrey, JA; Horsley, SA; Hooper, Ian R.; Sambles, JR; Hibbins, Alastair P. (Nature Publishing Group: Open Access Journals - Option C, 2016-02-23)
    Waves propagating in a negative-index material have wave-front propagation (wavevector, k) opposite in direction to that of energy flow (Poynting vector, S). Here we present an experimental realisation at microwave frequencies ...
  • Direct Optical Quantification of Backflow in a 90° Twisted Nematic Cell 

    Smith, N. J.; Tillin, M. D.; Sambles, J. Roy (American Physical Society, 2002)
    Optical guided mode observations of the transient director profile (optical tensor distribution) during the relaxation of a 90° twisted nematic cell directly reveals backflow. In the first 6 ms of the relaxation process, ...
  • Directly observing continuum emission from self-gravitating spiral waves 

    Hall, C; Forgan, D; Rice, K; Harries, TJ; Klaassen, PD; Biller, B (Oxford University Press (OUP) / Royal Astronomical Society, 2016)
    We use a simple, self-consistent, self-gravitating semi-analytic disc model to conduct an examination of the parameter space in which self-gravitating discs may exist. We then use Monte-Carlo radiative transfer to generate ...
  • Discovery of a bright eclipsing cataclysmic variable 

    Sing, David K.; Green, E.M.; Howell, S.B.; Holberg, J.B.; Lopez-Morales, M.; Shaw, J.S.; Schmidt, G.D. (EDP Sciences for European Southern Observatory (ESO), 2007)
    Aims.We report on the discovery of J0644+3344 , a bright, deeply-eclipsing cataclysmic variable (CV) binary. Methods.Optical photometric and spectroscopic observations were obtained to determine the nature and characteristics ...
  • Discovery of Seven Companions to Intermediate Mass Stars with Extreme Mass Ratios in the Scorpius-Centaurus Association 

    Hinkley, Sasha; Kraus, Adam L.; Ireland, Michael J.; Cheetham, Anthony; Carpenter, John M.; Tuthill, Peter; Lacour, Sylvestre; Evans, T.M.; Haubois, Xavier (American Astronomical Society / IoP Publishing, 2015-06-04)
    We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M ∼ 1.5–4.5Me) in the Scorpius–Centaurus (Sco–Cen) Association using nonredundant aperture masking interferometry. Ournewly detected ...
  • Dispersion of collective magnonic modes in stacks of nanoscale magnetic elements 

    Dvornik, Mykola; Kruglyak, V.V. (American Physical Society, 2011)
    We report a numerical study of the dispersion of collective magnonic modes in magnonic crystals formed by stacks of magnetostatically coupled magnetic nanoelements. The calculations reveal that the sign of the magnonic ...
  • Dispersion of surface plasmon polaritons on short-pitch metal gratings 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2002)
    The dispersion of surface plasmon polaritons (SPPs) has been calculated for short-pitch metal gratings for various depths. For gratings with depths greater than their pitch very flat SPP bands are formed in the zero-order ...
  • Distribution and mass of diffuse and dense CO gas in the Milky Way 

    Roman-Duval, J; Heyer, M; Brunt, C; Clark, P; Klessen, R; Shetty, R (American Astronomical Society, 2016-02-17)
    Emission from carbon monoxide (CO) is ubiquitously used as a tracer of dense star-forming molecular clouds. There is, however, growing evidence that a significant fraction of CO emission originates from diffuse molecular ...
  • Divergence of Casimir stress in inhomogeneous media 

    Simpson, William M.R.; Horsley, S.A.R.; Leonhardt, Ulf (American Physical Society, 2013)
    We examine the local behavior of the regularized stress tensor commonly used in calculations of the Casimir force for a dielectric medium inhomogeneous in one direction. It is shown that the usual expression for the stress ...
  • Domain-wall pinning, nonadiabatic spin-transfer torque, and spin-current polarization in permalloy wires doped with vanadium 

    Lepadatu, S.; Claydon, J.S.; Kinane, C.J.; Charlton, T.R.; Langridge, Sean; Potenza, A.; Dhesi, Sarnjeet S.; Keatley, Paul Steven; Hicken, R.J.; Hickey, B.J.; Marrows, C.H. (American Physical Society, 2010)
    Using pulsed-current measurements we investigate the domain-wall depinning via spin-transfer torque from pinning potentials in V-doped Ni80Fe20 wires. The domain-wall depinning boundary, showing the variation of threshold ...
  • Dominance of interface chemistry over the bulk properties in determining the electronic structure of epitaxial metal/perovskite oxide heterojunctions 

    Chambers, SA; Du, Y; Gu, M; Droubay, TC; Hepplestone, SP; Sushko, PV (American Chemical Society, 2015-05-13)
    We show that despite very similar crystallographic properties and work function values in bulk Fe and Cr, epitaxial films of these metals on Nb:SrTiO3(001) exhibit completely different heterojunction electronic properties. ...
  • Double-period zero-order metal gratings as effective selective absorbers 

    Tan, W.-C.; Sambles, J. Roy; Preist, T. W. (American Physical Society, 2000)
    The electromagnetic response of a zero-order metal grating having a primary deep short-period component and a shallow long-period component is modeled. It is found that such a metal grating has an unusual surface-plasmon-polariton ...
  • Drug delivery into microneedle-porated nails from nanoparticle reservoirs. 

    Chiu, Wing Sin; Belsey, Natalie A.; Garrett, Natalie; Moger, Julian; Price, GJ; Begoña Delgado-Charro, M; Guy, Richard H. (Elsevier, 2015-10-15)
    This study demonstrates the potential of polymeric nanoparticles as drug reservoirs for sustained topical drug delivery into microneedle-treated human nail. Laser scanning confocal microscopy was used to image the delivery ...
  • Dynamic configurational anisotropy in nanomagnets 

    Kruglyak, V.V.; Keatley, Paul Steven; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2007)
    The angular dependence of ultrafast magnetization dynamics in nanomagnets of square shape was studied by magneto-optical pump-probe measurements. In agreement with micromagnetic simulations, both the number of precessional ...