Now showing items 119-138 of 865

  • 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) ...
  • Consistency of certain constitutive relations with quantum electromagnetism 

    Horsley, S.A.R. (American Physical Society, 2011)
    Recent work by Philbin [ New J. Phys. 12 123008 (2010)] has provided a Lagrangian theory that establishes a general method for the canonical quantization of the electromagnetic field in any dispersive, lossy, linear ...
  • Continuous evolution of the in-plane magnetic anisotropies with thickness in epitaxial Fe films 

    Gester, M.; Daboo, C.; Hicken, R.J.; Gray, S.J.; Ercole, A.; Bland, J.A.C. (American Institute of Physics, 1996)
    We have studied the evolution of the magnetic in‐plane anisotropy in epitaxial Fe/GaAs films of both (001) and (110) orientation as a function of the Fe layer thickness using the longitudinal magneto‐optic Kerr effect and ...
  • A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion 

    Sing, David K.; Fortney, J.J.; Wakeford, H.R.; Nikolov, N.; Kataria, T; Aigrain, Suzanne; Balleseter, GE; Burrows, A.S.; Deming, D.; Desert, J.-M; Gibson, N.; Henry, G.; Huitson, Catherine M.; Knutson, H.; Lecavelier des Etangs, A.; Pont, F.; Showman, A.P.; Vidal-Madjar, A.; Williamson, M.H.; Wilson, Paul A. (Nature Publishing Group, 2015-12-14)
    Thousands of transiting exoplanets have been discovered, but spectral analysis of their atmospheres has so far been dominated by a small number of exoplanets and data spanning relatively narrow wavelength ranges (such as ...
  • Control of the stop band of an acoustic double fishnet 

    Murray, Alasdair R.J.; Hendry, Euan; Summers, I.R.; Sambles, J. Roy; Hibbins, Alastair P. (Journal of the Acoustical Society of America, 2013)
    The acoustic transmittance of two closely spaced solid plates, each perforated with a square array of cylindrical holes, exhibits a band of near-perfect acoustic attenuation originating from hybridization between a resonance ...
  • Controlling the generation of THz radiation from metallic films using periodic microstructure 

    Polyushkin, Dmitry K.; Hendry, Euan; Barnes, William L. (Springer Verlag, 2015-04-05)
    We report on THz frequency generation via irradiation of microstructured semicontinuous silver films by femtosecond laser pulses. By patterning the film so as to produce an array of microstrips, we show that one can use ...
  • Controlling the properties of surface acoustic waves using graphene 

    Bandhu, L; Nash, GR (Springer Verlag (Germany), 2015-12-23)
    The author(s) Surface acoustic waves (SAWs) are elastic waves that propagate on the surface of a solid, much like waves on the ocean, with SAW devices used widely in communication and sensing. The ability to dynamically ...
  • Coronal mass ejections and angular momentum loss in young stars 

    Aarnio, Alicia N.; Stassun, Keivan G.; Matt, Sean P. (Cambridge University Press, 2013)
    In our own solar system, the necessity of understanding space weather is readily evident. Fortunately for Earth, our nearest stellar neighbor is relatively quiet, exhibiting activity levels several orders of magnitude lower ...
  • The correlation of dust and gas emission in star-forming environments 

    Morgan, LK; Moore, TJT; Eden, DJ; Hatchell, J; Urquhart, JS (Oxford University Press (OUP) on behalf of the Royal Astronomical Society, 2014-01-01)
    We present ammonia maps of portions of the W3 and Perseus molecular clouds in order to compare gas emission with submillimetre continuum thermal emission which are commonly used to trace the same mass component in star-forming ...
  • Counting molecular-beam grown graphene layers 

    Plaut, Annette S.; Wurstbauer, Ulrich; Pinczuk, Aron; Garcia, Jorge M.; Pfeiffer, Loren N. (American Institute of Physics, 2013)
    We have used the ratio of the integrated intensity of graphene's Raman G peak to that of the silicon substrate's first-order optical phonon peak, accurately to determine the number of graphene layers across our molecular-beam ...
  • Coupled surface plasmon polaritons on thin metal slabs corrugated on both surfaces 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2004)
    A modelling study of the effect of coupled surface plasmon polaritons (SPPs) on the optical response of a thin metal film corrugated on both surfaces is presented. Initially the case of conformally corrugated metal films ...
  • Coupled surface plasmon-polariton mediated photoluminescence from a top-emitting organic light-emitting structure 

    Wedge, S.; Wasey, J. A. E.; Barnes, William L.; Sage, I. (American Institute of Physics, 2004)
    We report strong photoluminescence from a top-emitting organic light-emitting structure where emission takes place through a thin (55 nm) silver film. We show that this emission is mediated via coupled surface plasmon-polariton ...
  • Coupled surface plasmons and optical guided wave exploration of near-surface director profile 

    Yang, Fuzi; Ruan, Lizhen; Jewell, Sharon A.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    For a liquid crystal (LC) cell with thin silver claddings it is possible, using a high index coupling prism, to excite both surface plasmon modes and ordinary optical guided modes. In a situation where the tilt of the ...
  • Coupled surface-plasmon-like modes between metamaterial 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Sambles, J. Roy (American Physical Society, 2007)
    Perfectly conducting metals may be structured with holes to make metamaterials that support surface-plasmon-like modes at microwave frequencies. Results are presented for Fabry-Pérot-like standing wave resonances formed ...
  • The coupling of microwave radiation to surface plasmon polaritons and guided modes via dielectric gratings 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2000)
    It is shown that an absorbing dielectric layer, sinusoidally modulated in height, on top of a planar metal substrate, may be used to provide coupling between both s- and p-polarized incident microwave photons and surface ...
  • Coupling of near-grazing microwave photons to surface plasmon polaritons via a dielectric grating 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2000)
    A dielectric grating on top of a planar metal substrate is shown to couple near-grazing microwave photons to surface plasmon polaritons (SPPs). It is shown that when the grating grooves are oriented such that they are ...
  • Coupling Plasmonic Metamaterials To Single-Quantum-Well Gain 

    Meinzer, Nina (Karlsruher Institut für Technologie, 2011-07-01)
    Reducing unfavourable losses in metallic nanostructures by optical gain is currently one of the central topics in plasmonics and metamaterials research. The main prerequisite for this is the coupling between the plasmonic ...
  • Critical current scaling in long diffusive graphene-based Josephson junctions 

    Ke, Chung-Ting; Borzenets, IV; Draelos, Anne W.; Amet, Francois; Bomze, Yuriy; Jones, Gareth; Craciun, Monica F.; Russo, Saverio; Yamamoto, Michihisa; Tarucha, Seigo; Finkelstein, Gleb (arXiv.org, 2016)
    We present transport measurements on long diffusive graphene-based Josephson junctions. Several junctions are made on a single-domain crystal of CVD graphene and feature the same contact width of ~9$\mu$m but vary in length ...
  • Damped vacuum states of light 

    Philbin, TG (IOP Publishing, 2016-08-10)
    We consider one-dimensional propagation of quantum light in the presence of a block of material, with a full account of dispersion and absorption. The electromagnetic zero-point energy for some frequencies is damped ...
  • Damping the zero-point energy of a harmonic oscillator 

    Philbin, TG; Horsley, SAR (-, 2016)
    The physics of quantum electromagnetism in an absorbing medium is that of a field of damped harmonic oscillators. Yet until recently the damped harmonic oscillator was not treated with the same kind of formalism used to ...