Now showing items 205-224 of 449

  • Macroscopic ordering of polystyrene carboxylate-modified nanospheres self-assembled at the water-air interface 

    Sirotkin, Evgeny; Apweiler, Julius D.; Ogrin, Feodor Y. (American Chemical Society, 2010)
    We present results from an experimental study of ordering characteristics in monolayers of polystyrene nanospheres self-assembled at a water-air interface. We demonstrate that the interaction of spheres, governed by the ...
  • Magnesium in the atmosphere of the planet HD 209458 b: Observations of the thermosphere-exosphere transition region 

    Vidal-Madjar, A.; Huitson, Catherine M.; Bourrier, V.; Desert, J.-M.; Ballester, G.; Lecavelier des Etangs, A.; Sing, David K.; Ehrenreich, D.; Ferlet, R.; Hebrard, G.; McConnell, J.C. (EDP Sciences for European Southern Observatory (ESO), 2013)
    The planet HD 209458 b is one of the most well studied hot-Jupiter exoplanets. The upper atmosphere of this planet has been observed through ultraviolet/optical transit observations with H i observation of the exosphere ...
  • Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star 

    Lanza, A. F.; Pagano, I.; Leto, G.; Messina, S.; Aigrain, Suzanne; Alonso, R.; Auvergne, M.; Baglin, A.; Barge, P.; Bonomo, A. S.; Boumier, P.; Collier Cameron, A.; Comparato, M.; Cutispoto, G.; De Medeiros, J. R.; Foing, B.; Kaiser, A.; Moutou, C.; Parihar, P. S.; Silva-Valio, A.; Weiss, W. W. (EDP Sciences, 2009)
    Context. The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoTExo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 ...
  • Magnetic Cycles in a Convective Dynamo Simulation of a Young Solar-type Star 

    Brown, Benjamin P.; Miesch, Mark S.; Browning, Matthew K.; Brun, Allan Sacha; Toomre, Juri (American Astronomical Society / IOP Publishing, 2011)
    Young solar-type stars rotate rapidly and many are magnetically active. Some appear to undergo magnetic cycles similar to the 22 yr solar activity cycle. We conduct simulations of dynamo action in rapidly rotating suns ...
  • Magnetic imaging by x-ray holography using extended references 

    Duckworth, Thomas A.; Ogrin, Feodor Y.; Dhesi, Sarnjeet S.; Langridge, Sean; Whiteside, Amy; Moore, Thomas; Beutier, Guillaume; van der Laan, Gerrit (Optical Society of America, 2011)
    We demonstrate magnetic lensless imaging by Fourier transform holography using extended references. A narrow slit milled through an opaque gold mask is used as a holographic reference and magnetic contrast is obtained by ...
  • Magnetic second harmonic generation at the Co2MnSi/AlO x interface 

    Shelford, L.R.; Liu, Y.; Hicken, R.J.; Sakuraba, Y.; Oogane, M.; Ando, Y. (American Institute of Physics, 2008)
    We have studied magnetic second harmonic generation (MSHG) at the Co2MnSi/AlOx interface. The variation of the MSHG intensity was consistent with the nonvanishing components of the nonlinear susceptibility tensor expected ...
  • Magnetization reversal processes in epitaxial Fe/GaAs(001) films 

    Daboo, C.; Hicken, R.J.; Eley, D.E.P.; Gester, M.; Gray, S.J.; Ives, A.J.R.; Bland, J.A.C. (American Institute of Physics, 1994)
    In this article we present the results of a detailed study of the switching behavior observed in epitaxial single Fe films of thickness between 30 and 450 Å, and a wedge shaped Fe film with a thickness range of 10–60 Å ...
  • Magnetometry of low-dimensional electron and hole systems 

    Usher, Alan; Elliott, Martin (Institute of Physics, 2009)
    The high-magnetic-field, low-temperature magnetic properties of low-dimensional electron and hole systems reveal a wealth of fundamental information. Quantum oscillations of the thermodynamic equilibrium magnetization yield ...
  • Making Tunnel Barriers (Including Metals) Transparent 

    Hooper, Ian R.; Preist, T. W.; Sambles, J. Roy (American Physical Society, 2006)
    The classical "brick wall," which may, according to quantum mechanics, leak via tunneling, is here shown to be completely transparent when appropriate impedance matching media are placed both in front of and behind the ...
  • Massively sub-wavelength guiding of electromagnetic waves 

    Hooper, Ian R.; Tremain, B.; Dockrey, J.A.; Hibbins, Alastair P. (Nature Publishing Group, 2014)
    Recently a new form of ultra-thin flexible waveguide consisting of a conducting comb-like structure with a thickness of the order of 1/600(th) of the operating wavelength was presented. However, whilst the thickness of the ...
  • Measurement of hot electron momentum relaxation times in metals by femtosecond ellipsometry 

    Kruglyak, V.V.; Hicken, R.J.; Ali, M.; Hickey, B.J.; Pym, A.T.G.; Tanner, B.K. (American Physical Society, 2005)
    Time-resolved ellipsometric measurements were made upon Au, Cu, Ag, Ni, Pd, Ti, Zr, and Hf thin films. Using an elliptically polarized pump beam, the decay of the optically induced polarization of the sample was observed. ...
  • Measuring and modelling optical scattering and the colour quality of white pierid butterfly scales 

    Luke, S. M.; Vukusic, Peter; Hallam, B. T. (Optical Society of America, 2009)
    Colouration in butterfly wings is due to the interaction of light with a covering of scales on both wing surfaces. A combination of nanostructure in the scales, which reflect or scatter light, and absorption from chemical ...
  • Mechanisms of THz generation from silver nanoparticle and nanohole arrays illuminated by 100 fs pulses of infrared light 

    Polyushkin, Dmitry K.; Marton, I.; Racz, P.; Dombi, P.; Hendry, Euan; Barnes, William L. (American Physical Society, 2014)
    We study THz pulses generated from plasmonic metal nanostructures under femtosecond illumination of near-IR light. We find two regimes of excitation, according to the order of the dependence of the THz fluence on the ...
  • Metamaterial tunnel barrier gives broad band microwave transmission 

    Butler, Celia A.M.; Hooper, Ian R.; Hibbins, Alastair P.; Sambles, J. Roy (American Institute of Physics, 2011)
    A simple structure comprising a metal mesh, symmetrically surrounded by subwavelength thickness dielectric layers, is shown to give near total microwave transmission over a broad frequency range. The mesh may be considered ...
  • Microwave liquid-crystal variable phase grating 

    Yang, Fuzi; Sambles, J. Roy (American Institute of Physics, 2004)
    A voltage-controlled variable phase grating, at microwave frequencies, is described and its response characterized. It comprises a stack of 71 aluminium strips of 1 mm thickness separated by 75 µm spaces, filled with ...
  • Microwave resonances of ultrathin hexagonally-symmetric microcavity arrays 

    Brown, James R.; Hibbins, Alastair P.; Lawrence, Christopher R.; Lockyear, Matthew J.; Sambles, J. Roy (American Institute of Physics, 2012)
    A metamaterial surface formed by three slot gratings at 60° to each other has two possible high-symmetry arrangements. One forms equilateral triangular metal patches, the other a combination of hexagons and small equilateral ...
  • Microwave response of hole and patch arrays 

    Taylor, Melita C.; Edmunds, James D.; Hendry, Euan; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2010)
    The electromagnetic response of two-dimensional square arrays of perfectly conducting square patches, and their complementary structures, is modeled utilizing a modal matching technique and employing Babinet’s principle. ...
  • Microwave surface waves supported by a tapered geometry metasurface 

    Brock, Elizabeth M.G.; Hibbins, Alastair P. (American Institute of Physics, 2013)
    Spatial dependent reduction of a surface wave's group velocity is demonstrated in the microwave regime across a metasurface comprised linear array of rectangular cavities. We manipulate the surface wave dispersion through ...
  • Microwave surface-plasmon-like modes on thin metamaterials 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2009)
    It has recently been shown that the structured surface of a perfect conductor can support surface-plasmon-like modes [Pendry et al., Science 305, 847 (2004)]. Such structures have a thickness of at least the order of the ...
  • Microwave transmission of a compound metal grating 

    Hibbins, Alastair P.; Hooper, Ian R.; Lockyear, Matthew J.; Sambles, J. Roy (American Physical Society, 2006)
    An array of subwavelength slits in a metallic substrate supports a series of Fabry-Perot-like resonances, where each harmonic results in a transmission peak. Addition of extra slits per period yields a compound grating ...