Now showing items 73-92 of 208

  • 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 ...
  • Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission 

    Deeg, H. J.; Gillon, M.; Shporer, A.; Rouan, D.; Stecklum, B.; Aigrain, Suzanne; Alapini, Aude; Almenara, J.-M.; Alonso, R.; Barbieri, M.; Bouchy, F.; Eislöffel, J.; Erikson, A.; Fridlund, M.; Eigmüller, P.; Handler, G.; Hatzes, A.; Kabath, P.; Lendl, M.; Mazeh, T.; Moutou, C.; Queloz, D.; Rauer, H.; Rabus, M.; Tingley, B.; Titz, R. (EDP Sciences, 2009)
    The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d'être arises from the much higher spatial resolution ...
  • High surface area coatings for hydrogen evolution cathodes prepared by magnetron sputtering 

    Zhang, Xiaoling; Hampshire, Joanne; Cooke, Kevin; Li, Xiaohong; Pletcher, Derek; Wright, Shaun; Hyde, Kristian (Elsevier for International Association for Hydrogen Energy, 2015-02-19)
    A novel magnetron sputtering technique is described for the deposition of durable, high surface area metal and alloy deposits (thickness up to several microns) onto nickel and steel substrates. The materials deposited ...
  • High-frequency dielectric relaxation of liquid crystals: THz time-domain spectroscopy of liquid crystal colloids 

    Oh-e, Masahito; Yokoyama, Hiroshi; Koeberg, Mattijs; Hendry, Euan; Bonn, Mischa (Optical Society of America, 2006)
    Terahertz time-domain spectroscopy has been used to study the dielectric relaxation of pure 4’–n-pentyl–4–cyanobiphenyl (5CB) liquid crystal (LC) and its mixtures with 10 µm SiO2 particles in the frequency range 0.2–2 THz. ...
  • Importance of diffraction in determining the dispersion of designer surface plasmons 

    Hendry, Euan; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2008)
    By employing a modified modal matching approach, we obtain explicit analytical expressions relating frequency to in-plane wave vector for the surface electromagnetic mode confined at the interface between vacuum and a ...
  • Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution 

    Hendry, Euan; Koeberg, Mattijs; Schins, Juleon M.; Nienhuys, H. K.; Sundström, V.; Siebbeles, L. D. A.; Bonn, Mischa (American Physical Society, 2005)
    We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain ...
  • Leaky-wave exploration of two-stage switch-on in a nematic pi-cell 

    Ruan, Lizhen; Sambles, J. Roy (American Institute of Physics, 2005)
    The two-stage switch-on dynamics of a nematic pi-cell are explored in detail using a convergent beam fully-leaky guided mode technique. The cell shows an initial switch-on with a time scale in the range several ms to tens ...
  • Light circulation and weaving in periodically patterned structures 

    Crouse, David; Jaquay, Eric; Maikal, Abdur; Hibbins, Alastair P. (American Physical Society, 2008)
    The circulation and weaving of light in one-dimensionally periodic structures as a result of the excitation of phase resonances are described. It is shown that phase resonances occur for s-polarized incident light with ...
  • Light emission through a corrugated metal film: The role of cross-coupled surface plasmon polaritons 

    Wedge, S.; Hooper, Ian R.; Sage, I.; Barnes, William L. (American Physical Society, 2004)
    We examine the phenomenon of light emission through a thin metal film that takes place via surface plasmon polaritons. Surface plasmon polariton cross coupling has recently been invoked to explain sharp features observed ...
  • Light outcoupling efficiency of top-emitting organic light-emitting diodes 

    Smith, L. H.; Wasey, J. A. E.; Barnes, William L. (American Institute of Physics, 2004)
    We report results obtained from modeling the light outcoupling efficiency of top–emitting organic light-emitting diode (OLED) structures and compare them with results from conventional substrate-emitting structures. We ...
  • Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays 

    Parsons, J.; Hendry, Euan; Burrows, Christopher P.; Auguié, Baptiste; Sambles, J. Roy; Barnes, William L. (American Physical Society, 2009)
    We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through ...
  • Low angular-dispersion microwave absorption of a dual-pitch nondiffracting metal bigrating 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2003)
    The surface plasmon modes supported by a nondiffracting 90° bigrating consisting of three grooves per repeat period with one slightly shallower than the other two are characterized by studying the reflectivity from the ...
  • Low angular-dispersion microwave absorption of a metal dual-period nondiffracting hexagonal grating 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2005)
    The microwave (11.3<λ0<16.7 mm) reflectivity response of a nondiffracting dual-period hexagonal grating is explored. In three directions at 60° to each other, the aluminum grating has a repeat period of 7.2 mm in which ...
  • Low threshold edge emitting polymer distributed feedback laser based on a square lattice 

    Vasdekis, A. E.; Turnbull, G. A.; Samuel, I. D. W.; Andrew, P.; Barnes, William L. (American Institute of Physics, 2005)
    We report the demonstration of a low-threshold, edge-emitting polymer distributed feedback laser based on a square lattice. The lattice constant was 268 nm, which corresponds to a lattice line spacing in the ΓM symmetry ...
  • 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 ...
  • 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 ...
  • Materials and fabrication of electrode scaffolds for deposition of MnO2 and their true performance in supercapacitors 

    Li, Xiaohong; Cao, J; Wang, Yaming; Walsh, Frank C.; Ouyang, J; Jia, D; Zhou, Y (Elsevier B.V., 2015-06-06)
    MnO2 is a promising electrode material for high energy supercapacitors because of its large pseudo-capacitance. However, MnO2 suffers from low electronic conductivity and poor cation diffusivity, which results in poor ...
  • 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 ...
  • Metastable electron-electron states in double-layer graphene structures 

    Shytov, A.V.; Marnham, Lachlan L. (American Physical Society, 2015-08-07)
    The prototypical exciton model of two interacting Dirac particles in graphene was analyzed in J. Sabio et al., Phys. Rev. B 81, 045428 (2010) and it was found that in one of the electron-hole scattering channels the total ...
  • 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 ...