Now showing items 1-20 of 1090

  • 2 μm solid-state laser mode-locked by single-layer graphene 

    Lagatsky, A. A.; Sun, Z.; Kulmala, T. S.; Sundaram, R. S.; Milana, S.; Torrisi, F.; Antipov, O. L.; Lee, Y.; Ahn, J. H.; Brown, C. T. A.; Sibbett, W.; Ferrari, A. C. (2013-01-07) - Journal article
    We report a 2 μm ultrafast solid-state Tm : Lu2O3 laser, mode-locked by single-layer graphene, generating transform-limited similar to 410 fs pulses, with a spectral width similar to 11.1 nm at 2067 nm. The maximum average ...
  • 220GHz wideband 3D imaging radar for concealed object detection technology development and phenomenology studies 

    Robertson, Duncan Alexander; Macfarlane, David Graham; Bryllert, Tomas (SPIE-The International Society for Optical Engineering, 2016-05-12) - Conference item
    We present a 220 GHz 3D imaging ‘Pathfinder’ radar developed within the EU FP7 project CONSORTIS (Concealed Object Stand-Off Real-Time Imaging for Security) which has been built to address two objectives: (i) to de-risk ...
  • 3D Monte Carlo radiation transfer modelling of photodynamic therapy 

    Campbell, Catherine Louise; Christison, C.; Brown, C Tom A; Wood, Kenny; Valentine, Ronan Martin; Moseley, H. (SPIE, 2015-06) - Conference item
    The effects of ageing and skin type on Photodynamic Therapy (PDT) for different treatment methods have been theoretically investigated. A multilayered Monte Carlo Radiation Transfer model is presented where both daylight ...
  • 3D PiC code investigations of Auroral Kilometric Radiation mechanisms 

    Gillespie, K. M.; McConville, S. L.; Speirs, D. C.; Ronald, K.; Phelps, A. D. R.; Bingham, R.; Cross, A. W.; Robertson, C. W.; Whyte, C. G.; He, W.; Vorgul, I.; Cairns, R. A.; Kellett, B. J. (IOP PUBLISHING LTD, 2014) - Conference item
    Efficient (similar to 1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the ...
  • A 6% measurement of the Hubble parameter at z~0.45 : direct evidence of the epoch of cosmic re-acceleration 

    Moresco, Michele; Pozzetti, Lucia; Cimatti, Andrea; Jimenez, Raul; Maraston, Claudia; Verde, Licia; Thomas, Daniel; Citro, Annalisa; Tojeiro, Rita; Wilkinson, David (2016-05-04) - Journal article
    Deriving the expansion history of the Universe is a major goal of modern cosmology. To date, the most accurate measurements have been obtained with Type Ia Supernovae and Baryon Acoustic Oscillations, providing evidence ...
  • 94 GHz pulsed coherent radar for high power amplifier evaluation 

    Robertson, Duncan Alexander; Hunter, Robert Iain; Gallacher, Thomas (SPIE-The International Society for Optical Engineering, 2016-05-12) - Conference item
    We present the design and characterization of a 94 GHz pulsed coherent radar to be used for the evaluation and demonstration of novel wideband, high power vacuum tube amplifier technology. The radar is designed to be fully ...
  • Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001) 

    McKeown Walker, S; Riccò, S; Bruno, F Y; de la Torre, A; Tamai, A; Golias, E; Varykhalov, A; Marchenko, D; Hoesch, M; Bahramy, M S; King, Philip David; Sánchez-Barriga, J; Baumberger, F (2016-06-22) - Journal article
    We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander-Syro et al. [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented ...
  • Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene 

    Montilla, Francisco; Ruseckas, Arvydas; Samuel, Ifor David William (2013-10-14) - Journal article
    Absorption induced by electrochemically injected holes is studied in poly-9,9-dioctylfluorene (PFO) films. Injected charges form positive polarons which are delocalised over four fluorene units in the glassy phase and about ...
  • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

    Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
    Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
  • Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga 

    Davies, Claire; Gregory, Scott; Greaves, Jane Sophia (2014-10-21) - Journal article
    In light of recent substantial updates to spectral type estimations and newly established intrinsic colours, effective temperatures, and bolometric corrections for pre-main sequence (PMS) stars, we re-address the theory ...
  • The accretion dynamics of EX Lupi in quiescence : the star, the spot, and the accretion column 

    Sicilia-Aguilar, Aurora; Fang, Min; Roccatagliata, Veronica; Collier Cameron, Andrew; Kóspál, Ágnes; Henning, Thomas; Ábrahám, Peter; Sipos, Nikoletta (2015-08-06) - Journal article
    Context. EX Lupi is a young, accreting M0 star and the prototype of EXor variable stars. Its spectrum is very rich in emission lines, including many metallic lines with narrow and broad components. The presence of a close ...
  • The accumulation and trapping of grains at planet gaps : effects of grain growth and fragmentation 

    Gonzalez, J.-F.; Laibe, G.; Maddison, S.T.; Pinte, C.; Ménard, F. (2015) - Journal article
    We model the dust evolution in protoplanetary disks with full 3D, Smoothed Particle Hydrodynamics (SPH), two-phase (gas+dust) hydrodynamical simulations. The gas+dust dynamics, where aerodynamic drag leads to the vertical ...
  • Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237 

    Alvarado-Gómez, J.D.; Hussain, Gaitee Ara Jaffer; Grunhut, J.; Fares, Rim; Donati, J.-F.; Alecian, E.; Kochukhov, O.; Oksala, M.; Morin, J.; Redfield, S.; Cohen, O.; Drake, J.J.; Jardine, Moira Mary; Matt, S.; Petit, P.; Walter, F.M. (2015-10) - Journal article
    We analyse the magnetic activity characteristics of the planet-hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational modulation of the magnetic longitudinal field ...
  • Advanced application of flexible metamaterials at visible frequencies 

    Kirkpatrick, B.C.; Reader-Harris, P.; Shen, Y.; Wu, J.; Di Falco, A. (SPIE, 2015-02-27) - Conference item
    Flexible metamaterials (FMMs) at optical frequencies can conform to a wide range of target geometries whilst allowing their optical properties to be tuned post-fabrication. Here we discuss this potential by presenting our ...
  • Advances in small lasers 

    Hill, Martin T; Gather, Malte Christian (2014-12) - Journal article
    Small lasers have dimensions or modes sizes close to or smaller than the wavelength of emitted light. In recent years there has been significant progress towards reducing the size and improving the characteristics of these ...
  • The advantages of using a Lucky Imaging camera for observations of microlensing events 

    Sajadian, Sedighe; Rahvar, Sohrab; Dominik, Martin; Hundertmark, Markus (2016-05-21) - Journal article
    In this work, we study the advantages of using a Lucky Imaging camera for the observations of potential planetary microlensing events. Our aimis to reduce the blending effect and enhance exoplanet signals in binary lensing ...
  • Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas 

    Nitsche, W.H.; Kim, N.Y.; Roumpos, G.; Schneider, C.; Kamp, M.; Höfling, S.; Forchel, A.; Yamamoto, Y. (2014-11-24) - Journal article
    We observe quasi-long-range coherence in a two-dimensional condensate of exciton-polaritons. Our measurements confirm that the spatial correlation algebraically decays with a slow power law, whose exponent quantitatively ...
  • Algorithm based comparison between the integral method and harmonic analysis of the timing jitter of diode-based and solid-state pulsed laser sources 

    Metzger, N.K.; Su, C.-R.; Edwards, T.J.; Brown, C.T.A. (2015-04-15) - Journal article
    A comparison between two methods of timing jitter calculation is presented. The integral method utilizes spectral area of the single side-band (SSB) phase noise spectrum to calculate root mean square (rms) timing jitter. ...
  • Algorithm-based continuous pulse duration tuning and performance control of a mode-locked laser diode 

    Metzger, N Klaus; Olle, V. F.; Wonfor, A.; Penty, R. V.; White, I. H.; Mazilu, Michael; Brown, C Tom A; Sibbett, Wilson (2012-03-26) - Journal article
    A control algorithm is presented that addresses the stability issues inherent to the operation of monolithic mode-locked laser diodes. It enables a continuous pulse duration tuning without any onset of Q-switching ...
  • Alignment in star-debris disc systems seen by Herschel 

    Greaves, Jane Sophia; Kennedy, G. M.; Thureau, N.; Eiroa, C.; Marshall, J. P.; Maldonado, J.; Matthews, B. C.; Olofsson, G.; Barlow, M. J.; Moro-Martin, A.; Sibthorpe, B.; Absil, O.; Ardila, D. R.; Booth, M.; Broekhoven-Fiene, H.; Brown, David John Alexander; Collier Cameron, A.; del Burgo, C.; Di Francesco, J.; Duchene, G.; Eisloffel, J.; Ertel, S.; Holland, W. S.; Horner, J.; Kalas, P.; Kavelaars, J. J.; Lestrade, J. -F.; Vican, L.; Wilner, D. J.; Wolf, S.; Wyatt, M. C. (2014-02-11) - Journal article
    Many nearby main-sequence stars have been searched for debris using the far-infrared Herschel satellite, within the DEBRIS, DUNES and Guaranteed-Time Key Projects. We discuss here 11 stars of spectral types A–M where the ...