Now showing items 613-632 of 866

  • Quantifying distortions in two-photon remote focussing microscope images using a volumetric calibration specimen 

    Corbett, Alexander D.; Burton, Rebecca A.B.; Bub, Gil; Salter, Patrick S.; Tuohy, Simon; Booth, Martin J.; Wilson, Tony (Frontiers Media, 2014-10-08)
    Remote focussing microscopy allows sharp, in-focus images to be acquired at high speed from outside of the focal plane of an objective lens without any agitation of the specimen. However, without careful optical alignment, ...
  • Quantum correlation of light scattered by disordered media 

    Starshynov, Ilya; Bertolotti, Jacopo; Anders, Janet (Optical Society of America, 2016)
    We study theoretically how multiple scattering of light in a disordered medium can spontaneously generate quantum correlations. In particular we focus on the case where the input state is Gaussian and characterize the ...
  • Quantum dynamics of the damped harmonic oscillator 

    Philbin, Thomas G. (Institute of Physics, 2012)
    The quantum theory of the damped harmonic oscillator has been a subject of continual investigation since the 1930s. The obstacle to quantization created by the dissipation of energy is usually dealt with by including a ...
  • Quantum electrodynamics in the presence of moving bodies 

    Horsley, SAR (Progress In Electromagnetics Research (PIER), 2013-08)
    The vacuum state of the electromagnetic field close to a dielectric body is not the same in all reference frames. Here we show that this has some surprising consequences. For instance, if we attempt to quantize electromagnetism ...
  • Quantum Hall induced currents and the magnetoresistance of a quantum point contact 

    Smith, Martin J.; Williams, Charles D.H.; Shytov, A.V.; Usher, Alan; Sachrajda, A.S.; Kam, A.; Wasilewski, Z.R. (Institute of Physics, 2011)
    We report measurements of quantum Hall induced currents from their magnetisation and from their effect on the conductance of a quantum point contact. Features in the magnetic moment and QPC resistance are correlated at ...
  • Quantum levitation by left-handed metamaterials 

    Leonhardt, Ulf; Philbin, Thomas G. (Institute of Physics, 2007)
    Left-handed metamaterials make perfect lenses that image classical electromagnetic fields with significantly higher resolution than the diffraction limit. Here we consider the quantum physics of such devices. We show that ...
  • Quantum optics of spatial transformation media 

    Leonhardt, Ulf; Philbin, Thomas G. (Institute of Physics / European Optical Society, 2007)
    Transformation media are at the heart of invisibility devices, perfect lenses and artificial black holes. In this paper, we consider their quantum theory. We show how transformation media map quantum electromagnetism in ...
  • Quantum Thermodynamics 

    Vinjanampathy, Sai; Anders, J (Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2016-07-20)
    Quantum thermodynamics is an emerging research field aiming to extend standard thermodynamics and non-equilibrium statistical physics to ensembles of sizes well below the thermodynamic limit, in non-equilibrium situations, ...
  • Quasi-exact solution to the Dirac equation for the hyperbolic-secant potential 

    Hartmann, Richard R.; Portnoi, M.E. (American Physical Society, 2014)
    We analyze bound modes of two-dimensional massless Dirac fermions confined within a hyperbolic secant potential, which provides a good fit for potential profiles of existing top-gated graphene structures. We show that bound ...
  • Radiation damping in atomic photonic crystals 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2011)
    The force exerted on a material by an incident beam of light is dependent upon the material’s velocity in the laboratory frame of reference. This velocity dependence is known to be difficult to measure, as it is proportional ...
  • Radiation damping optical enhancement in cold atoms 

    Wu, Jin-Hui; Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Nature Publishing Group, 2013)
    The typically tiny effect of radiation damping on a moving body can be amplified to a favorable extent by exploiting the sharp reflectivity slope at one edge of an optically induced stop-band in atoms loaded into an optical ...
  • Radiation pressure in stratified moving media 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2012)
    A general theory of optical forces on moving bodies is here developed in terms of generalized 4×4 transfer and scattering matrices. Results are presented for a planar dielectric of arbitrary refractive index placed in an ...
  • Radiation pressure on a moving body: Beyond the Doppler effect 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Optical Society of America, 2012)
    The dependence of macroscopic radiation pressure on the velocity of the object being pushed is commonly attributed to the Doppler effect. This need not be the case, and here we highlight velocity-dependent radiation pressure ...
  • Radiation-hydrodynamical simulations of massive star formation using Monte Carlo radiative transfer - I. Algorithms and numerical methods 

    Harries, Tim J. (Oxford University Press for Royal Astronomical Society, 2015-03-10)
    We present a set of new numerical methods that are relevant to calculating radiation pressure terms in hydrodynamics calculations, with a particular focus on massive star formation. The radiation force is determined from ...
  • Raman spectroscopy for medical diagnostics - From in-vitro biofluid assays to in-vivo cancer detection 

    Kong, K; Kendall, C; Stone, N; Notingher, I (Elsevier, 2015)
    Raman spectroscopy is an optical technique based on inelastic scattering of light by vibrating molecules and can provide chemical fingerprints of cells, tissues or biofluids. The high chemical specificity, minimal or lack ...
  • Rapid circumstellar disk evolution and an accelerating star formation rate in the Infrared Dark Cloud M17 SWex 

    Povich, Matthew S.; Townsley, Leisa K.; Robitaille, Thomas P.; Broos, Patrick S.; Orbin, Wesley T.; King, Robert R.; Naylor, Tim; Whitney, Barbara A. (American Astronomical Society, 2016-07-11)
    We present a catalog of 840 X-ray sources and rst results from a 100 ks Chandra X-ray Observatory imaging study of the lamentary infrared dark cloud G014.225{00.506, which forms the central regions of a larger cloud complex ...
  • Rapid switching in a dual-frequency hybrid aligned nematic liquid crystal cell 

    Jewell, Sharon A.; Taphouse, T. S.; Sambles, J. Roy (American Institute of Physics, 2005)
    We report the optical characterization of a dual-frequency hybrid aligned nematic (HAN) liquid crystal cell driven between two states using a multiple-frequency sinusoidal pulse. The complex dynamic director structure ...
  • Rate and nature of false positives in the CoRoT exoplanet search 

    Almenara, J.-M.; Deeg, H. J.; Aigrain, Suzanne; Alonso, R.; Auvergne, M.; Baglin, A.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Bruntt, H.; Cabrera, J.; Carone, L.; Carpano, S.; Catala, C.; Csizmadia, Sz.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gandolfi, D.; Gillon, M.; Gondoin, P.; Guenther, E. W.; Guillot, T.; Hatzes, A.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Loeillet, B.; Magain, P.; Mayor, M.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Schneider, J.; Shporer, A.; Wuchterl, G.; Zucker, S. (EDP Sciences, 2009)
    Context. The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12,000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of ...
  • Rayleigh scattering by H2 in the extrasolar planet HD 209458b 

    Lecavelier des Etangs, A.; Vidal-Madjar, A.; Desert, J.-M.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    Transiting planets, such as HD 209458b, offer a unique opportunity to scrutinize the planetary atmospheric content. Although molecular hydrogen is expected to be the main atmospheric constituent, H2 remains uncovered ...
  • Rayleigh scattering in the transit spectrum of HD 189733b 

    Lecavelier des Etangs, A.; Pont, F.; Vidal-Madjar, A.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    The transit spectrum of the exoplanet HD 189733b has recently been obtained between 0.55 and 1.05 m. Here we present an analysis of this spectrum. We develop first-order equations to interpret absorption spectra. In the ...