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Welcome to the research outputs of the University of Exeter's Electromagnetic Materials Group, part of the College of Engineering, Mathematics and Physical Sciences

Recent Submissions

  • Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures (dataset) 

    Mushenok, F; Dost, R; Davies, C; Allwood, D; Inkson, B; Hrkac, G; Kruglyak, V (University of Exeter, 2017-07-17)
    Dataset for the article "Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures" by F. B. Mushenok, R. Dost, C. S. Davies, D. A. Allwood, B. J. Inkson, G. Hrkac, and V. V. Kruglyak ...
  • Resonantly induced transparency for metals with low angular dependence (dataset) 

    Camacho, Miguel; Hibbins, Alastair P.; Sambles, J. Roy (AIP, 2016-12-01)
    Thin (sub skin-depth) metal layers are known to almost completely reflect radiation at microwave frequencies. It has previously been shown that this can be overcome at resonance via the addition of closely spaced periodic ...
  • Nonlinear optical excitation of plasmons in graphene: intensity and polarisation dependences 

    Constant, Thomas (Royal Society, 2016-06-15)
    Recently, we demonstrated an all-optical coupling scheme for plasmons, which takes advantage of the intrinsic nonlinear optical response of graphene. Difference frequency mixing using free-space, visible light pulses ...
  • Time-resolved scanning Kerr microscopy of flux beam formation in hard disk write heads (dataset) 

    Valkass, Robert Alexander James; Spicer, Timothy M; Burgos Parra, Erick; Hicken, Robert James; Bashir, Muhammad A; Gubbins, Mark A; Czoschke, Peter J; Lopusnik, Radek (University of Exeter, 2016-04-14)
    Data behind the published paper "Time-resolved scanning Kerr microscopy of flux beam formation in hard disk write heads"
  • Effect of sink layer thickness on damping in CoMnGe (5 nm) / Ag (6 nm) / NiFe (x nm) spin valves 

    Valkass, Robert Alexander James; Shelford, Leigh R; Durrant, Chris J; Figueroa, Adriana; Baker, Alex A; Shafer, Padraic; Arenholz, Elke; Childress, Jeffrey R; Katine, Jordan A; van der Laan, Gerrit; Hicken, Robert J (University of Exeter, 2016-04-04)
    In spin valve structures the damping of a ferromagnetic layer driven at resonance can be modified by the transfer of spin angular momentum into a ‘sink’ ferromagnetic layer. This effect, known as spin pumping, is interface ...
  • Surface lattice resonances in plasmonic arrays of asymmeric disc dimers (dataset) 

    Humphrey, Alastair D; Meinzer, Nina; Starkey, Timothy A; Barnes, William L. (University of Exeter, 2016-03)
    We study regular wavelength scale arrays of metallic dimers. By employing dimers made up of two different sized discs, we are able to couple to array-based collective surface lattice resonances of both bright and dark, ...
  • Observation of vortex dynamics in arrays of nanomagnets 

    Yu, W.; Keatley, Paul Steven; Gangmei, Prim; Marcham, Max K.; Loughran, T. H. J.; Hicken, R.J.; Cavill, Stuart A.; van der Laan, Gerrit; Childress, J.R.; Katine, J.A. (American Physical Society, 2015-05-22)
    Vortex dynamics within arrays of square ferromagnetic nanoelements have been studied by time-resolved scanningKerr microscopy (TRSKM),while x-ray photoemission electronmicroscopy has been used to investigate the equilibrium ...
  • ORE demo 

    Alastair, Hibbins (Uni of Exeter, 2013-10-04)
    An abstract
  • Dataset of Observation of T2-like coherent optical phonons in epitaxial Ge2Sb2Te5/GaSb(001) films 

    Shalini, Ashawaraya; Liu, Y.; Al-Jarah, Uday Ali Sabeeh; Srivastava, G.P.; Wright, C. David; Katmis, F.; Braun, W.; Hicken, R.J. (University of Exeter, 2013-10-04)
    The phonon spectrum of Ge2Sb2Te5 is a signature of its crystallographic structure and underlies the phase transition process used in memory applications. Epitaxial materials allow coherent optical phonons to be studied in ...
  • Babinet’s principle and the band structure of surface waves on patterned metal arrays 

    Edmunds, James D.; Taylor, Melita C.; Hibbins, Alastair P.; Sambles, J. Roy; Youngs, I.J. (American Institute of Physics, 2010)
    The microwave response of an array of square metal patches and its complementary structure, an array of square holes, has been experimentally studied. The resonant phenomena, which yield either enhanced transmission or ...
  • Flow-driven transition and associated velocity profiles in a nematic liquid-crystal cell 

    Jewell, Sharon A.; Cornford, Stephen Leslie; Yang, Fuzi; Cann, P. S.; Sambles, J. Roy (American Physical Society, 2009)
    The alignment properties and distribution of flow speed during Poiseuille flow through a microchannel of a nematic liquid crystal in a cell with homeotropic surface alignment has been measured using a combination of ...
  • Sculpted-multilayer optical effects in two species of Papilio butterfly 

    Vukusic, Peter; Sambles, J. Roy; Lawrence, Christopher R.; Wakely, Gavin (Optical Society of America, 2001)
    The wing-scale microstructures associated with two species of Papilio butterfly are described and characterized. Despite close similarities in their structures, they do not exhibit analogous optical effects. With Papilio ...
  • Grazing-incidence iridescence from a butterfly wing 

    Lawrence, Christopher R.; Vukusic, Peter; Sambles, J. Roy (Optical Society of America, 2002)
    The Troides magellanus butterfly exhibits a specialized iridescence that is visible only when its hind wings are both illuminated and viewed at near-grazing incidence. The effect is due to the presence of a constrained ...
  • Otto-coupled surface plasmons in a liquid crystal cell 

    Ruan, Lizhen; Yang, Fuzi; Sambles, J. Roy (American Institute of Physics, 2009)
    Surface plasmons on silver in the visible domain are excited using a several micron thick layer of liquid crystal as the optical tunnel barrier. This thickness is possible when the orientation of the director in the liquid ...
  • Conoscopic observation of director reorientation during Poiseuille flow of a nematic liquid crystal 

    Holmes, Christopher J.; Cornford, Stephen Leslie; Sambles, J. Roy (American Institute of Physics, 2009)
    Director reorientation under pressure driven (Poiseuille) flow is observed conoscopically for the liquid crystal 5CB aligned at an azimuthal angle of 45° to the direction of flow. A polyimide surface treatment (AL 1254) ...
  • Developing optical efficiency through optimized coating structure: biomimetic inspiration from white beetles 

    Hallam, B. T.; Hiorns, Anthony G.; Vukusic, Peter (Optical Society of America, 2009)
    The recent discovery of brilliant whiteness in ultrathin beetle scales indicated the availability of significant whiteness, brightness, and opacity from limited sample thickness. This is achieved in the beetle through ...
  • 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 ...
  • Microwave transmissivity of a metamaterial–dielectric stack 

    Butler, Celia A.M.; Parsons, James; Sambles, J. Roy; Hibbins, Alastair P.; Hobson, Peter A. (American Institute of Physics, 2009)
    A metamaterial layer comprising of a conducting square mesh surrounding subwavelength holes has a largely pure imaginary effective refractive index. We explore the microwave transmissivity of a stack of such metamaterial ...
  • Surface plasmon polaritons on deep, narrow-ridged rectangular gratings 

    Gadsdon, Martyn Richard; Hooper, Ian R.; Hibbins, Alastair P.; Sambles, J. Roy (Optical Society of America, 2009)
    The dispersion diagrams of surface plasmon polaritons have been calculated for rectangular gratings, with very narrow wires, of varying depths. For gratings with a moderate height a family of vertical-standing-wave resonances ...
  • Phase resonances on metal gratings of identical, equally spaced alternately tapered slits 

    Rance, Helen J.; Hamilton, Oliver K.; Sambles, J. Roy; Hibbins, Alastair P. (American Institute of Physics, 2009)
    Phase resonances are observed in the microwave response of metal transmission gratings comprised of identical but alternately orientated tapered slits. Despite each slit having identical dimensions, and being equally spaced ...

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