Now showing items 350-369 of 471

  • 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 ...
  • Search for Carbon Monoxide in the Atmosphere of the Transiting Exoplanet HD 189733b 

    Desert, J.-M.; Lecavelier des Etangs, A.; Hebrard, G.; Sing, David K.; Ehrenreich, D.; Ferlet, R.; Vidal-Madjar, A. (IOP Publishing for American Astronomical Society, 2009)
    Water, methane, and carbon monoxide are expected to be among the most abundant molecules besides molecular hydrogen in the hot atmosphere of close-in extrasolar giant planets. Atmospheric models for these planets predict ...
  • A search for methane in the atmosphere of GJ 1214b via GTC narrow-band transmission spectrophotometry 

    Wilson, Paul A.; Colon, K.D.; Sing, David K.; Ballester, G.; Desert, J.-M.; Ehrenreich, D.; Ford, E.B.; Fortney, J.J.; Lecavelier des Etangs, A.; Lopez-Morales, M.; Morley, C.V.; Pettitt, Alex R.; Pont, F.; Vidal-Madjar, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2014)
    We present narrow-band photometric measurements of the exoplanet GJ 1214b using the 10.4 m Gran Telescopio Canarias and the Optical System for Imaging and low Resolution Integrated Spectroscopy instrument. Using tuneable ...
  • Searching for confined modes in graphene channels: The variable phase method 

    Stone, D.A.; Downing, C.A.; Portnoi, M.E. (American Physical Society, 2012)
    Using the variable phase method, we reformulate the Dirac equation governing the charge carriers in graphene into a nonlinear first-order differential equation from which we can treat both confined-state problems in electron ...
  • The secondary eclipse of CoRoT-1b 

    Alonso, R.; Alapini, Aude; Aigrain, Suzanne; Auvergne, M.; Baglin, A.; Barbieri, M.; Barge, P.; Bonomo, A. S.; Bordé, P.; Bouchy, F.; Chaintreuil, S.; De la Reza, R.; Deeg, H. J.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; De Oliveira Fialho, F.; Gondoin, P.; Guillot, T.; Hatzes, A.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Rouan, D.; Schneider, J.; Wuchterl, G. (EDP Sciences, 2009)
    The transiting planet CoRoT-1b is thought to belong to the pM-class of planets, in which the thermal emission dominates in the optical wavelengths. We present a detection of its secondary eclipse in the CoRoT white channel ...
  • The secondary eclipse of the transiting exoplanet CoRoT-2b 

    Alonso, R.; Guillot, T.; Mazeh, T.; Aigrain, Suzanne; Alapini, Aude; Barge, P.; Hatzes, A.; Pont, F. (EDP Sciences, 2009)
    We present a study of the light curve of the transiting exoplanet CoRoT-2b, aimed at detecting the secondary eclipse and measuring its depth. The data were obtained with the CoRoT satellite during its first run of more ...
  • Selective transmission through very deep zero-order metallic gratings at microwave frequencies 

    Went, H. E.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R.; Crick, A. P. (2000)
    Zero-order metal grating structures are found to give extraordinary selective transmission at microwave frequencies through the resonant excitation of coupled surface waves. The metal slat structures with dielectric spacings ...
  • Self-Organized Periodic Photonic Structure in a Nonchiral Liquid Crystal 

    Ruan, Lizhen; Sambles, J. Roy; Stewart, I. W. (American Physical Society, 2003)
    A hybrid-aligned cell of the smectic A liquid material 8CB gives two stable director configurations, one of which is periodic and gives strong diffraction of light. This photonic lattice director profile arises from ...
  • Sensing using differential surface plasmon ellipsometry 

    Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    In this work a differential ellipsometric method utilizing surface plasmons (SPs) for monitoring refractive index changes, which could be used in chemical and biological sensors, is presented. The method is based upon ...
  • Sensitivity of Localized Surface Plasmon Resonances to Bulk and Local Changes in the Optical Environment 

    Murray, W. Andrew; Auguié, Baptiste; Barnes, William L. (American Chemical Society, 2009)
    Single rod-shaped and disk-shaped gold nanoparticles with sizes ranging from 60 to 162 nm were analyzed using dark-field scattering spectroscopy. The sensitivity of the localized surface plasmon resonance (LSPR) of each ...
  • The signature of hot hydrogen in the atmosphere of the extrasolar planet HD 209458b 

    Ballester, G.; Sing, David K.; Herbert, Floyd (Nature Publishing Group, 2007)
    About ten per cent of the known extrasolar planets are gas giants that orbit very close to their parent stars. The atmospheres of these 'hot Jupiters' are heated by the immense stellar irradiation. In the case of the planet ...
  • Simple theory of hot electron dynamics observed by femtosecond ellipsometry 

    Kruglyak, V.V.; Hicken, R.J. (American Institute of Physics, 2006)
    The dynamics of the linear and angular momenta of hot electrons in metals are of key importance for the design and operation of hot electron devices such as spin and tunnel valve transistors. The corresponding relaxation ...
  • Simulations of Dynamo Action in Fully Convective Stars 

    Browning, Matthew K. (American Astronomical Society / IOP Publishing, 2008)
    We present three-dimensional nonlinear magnetohydrodynamic simulations of the interiors of fully convective M dwarfs. Our models consider 0.3 solar-mass stars using the Anelastic Spherical Harmonic code, with the spherical ...
  • Simultaneous ultrafast probing of intramolecular vibrations and photoinduced charge carriers in rubrene using broadband time-domain THz spectroscopy 

    Koeberg, Mattijs; Hendry, Euan; Schins, Juleon M.; van Laarhoven, Hendrik A.; Flipse, Cees F. J.; Reimann, Klaus; Woerner, Michael; Elsaesser, Thomas; Bonn, Mischa (American Physical Society, 2007)
    We determine the ultrafast frequency- and time-resolved complex dielectric responses of photoexcited, single-crystal rubrene in the frequency range of 10–30 THz (330–1000 cm−1) using ultrafast broadband THz spectroscopy. ...
  • Single-mode and multimode Fabry-Pérot interference in suspended graphene 

    Oksanen, Mika; Uppstu, Andreas; Laitinen, Antti; Cox, Daniel J.; Craciun, Monica F.; Russo, Saverio; Harju, Ari; Hakonen, Pertti (American Physical Society, 2014-03)
    We have achieved high-quality Fabry-Pérot interference in a suspended graphene device both in conductance and in shot noise. A Fourier analysis of these reveals two sets of overlapping, coexisting interference patterns, ...
  • Slow waves caused by cuts perpendicular to a single subwavelength slit in metal 

    Suckling, James R.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    Resonant transmission of microwaves through a subwavelength slit in a thick metal plate, into which subwavelength cuts have been made, is explored. Two orientations of the cuts, parallel and perpendicular to the long axis ...
  • Small angle x-ray and neutron scattering study of disordered and three dimensional-ordered magnetic protein arrays 

    Kasyutich, O.; Tatchev, D.; Hoell, A.; Ogrin, Feodor Y.; Dewhurst, C.; Schwarzacher, W. (American Institute of Physics, 2009)
    The magnetic nanoparticles of Fe3O4-γ–Fe2O3 grown inside the cavity of globular proteins (apoferritin)-magnetoferritin proved to be a useful model system for studying the fundamental effects of magnetostatic interactions ...
  • Small surface pretilt strikingly affects the director profile during Poiseuille flow of a nematic liquid crystal. 

    Holmes, Christopher J.; Cornford, Stephen Leslie; Sambles, J. Roy (American Physical Society, 2010)
    Conventional nematic liquid crystal cells are fabricated with small surface pretilt of the director induced by rubbed polymer alignment. Depending on the orientation of the bounding surfaces, this may lead to two slightly ...
  • Smooth electron waveguides in graphene 

    Hartmann, Richard R.; Robinson, N.J.; Portnoi, M.E. (American Physical Society, 2010)
    We present exact analytical solutions for the zero-energy modes of two-dimensional massless Dirac fermions fully confined within a smooth one-dimensional potential V(x)=−α/cosh(βx), which provides a good fit for potential ...
  • Some considerations on the transmissivity of thin metal films 

    Hooper, Ian R.; Sambles, J. Roy (Optical Society of America, 2008)
    As interest in plasmonics grows the optical properties of thin metal films becomes increasingly significant. Here we explore the transmissivity of thin metal films at normal incidence, from the ultraviolet to microwaves, ...