Now showing items 1-20 of 61

  • A 220 GHz 3D imaging radar with sub-cm3 voxel resolution for security applications 

    Robertson, Duncan Alexander; MacFarlane, David Graham; Bryllert, Tomas (IEEE, 2017-01-19) - Conference item
    Radars operating at high millimetre and sub-millimetre wave frequencies are promising candidates for security applications such as people screening since they offer the possibility to form 3D images through clothing with ...
  • 220GHz wideband 3D imaging radar for concealed object detection technology development and phenomenology studies 

    Robertson, Duncan Alexander; Macfarlane, David Graham; Bryllert, Tomas (SPIE, 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 ...
  • 94 GHz pulsed coherent radar for high power amplifier evaluation 

    Robertson, Duncan Alexander; Hunter, Robert Iain; Gallacher, Thomas (SPIE, 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 ...
  • Can quantum gas microscopes directly image exotic glassy phases? 

    Thomson, Steven John; Walker, Liam S.; Harte, Tiffany L.; Bruce, Graham David (2016-08-30) - Conference poster
    With the advent of spatially resolved fluorescence imaging in quantum gas microscopes (see e.g. [1]), it is now possible to directly image glassy phases and probe the local effects of disorder in a highly controllable ...
  • Client-side energy costs of video streaming 

    Ejembi, Oche; Bhatti, Saleem N. (Institute of Electrical and Electronics Engineers Inc., 2016-02-01) - Conference item
    Through measurements on our testbed, we show how users of Netflix could make energy savings of up to 34% by adjusting video quality settings. We estimate the impacts of these quality settings on the energy consumption of ...
  • Coherence protection in coupled quantum systems 

    Cammack, Helen Mary; Kirton, Peter George; Stace, Thomas; Eastham, Paul; Keeling, Jonathan Mark James; Lovett, Brendon William (2018-02) - Journal article
    The interaction of a quantum system with its environment causes decoherence, setting a fundamental limit on its suitability for quantum information processing. However, we show that if the system consists of coupled parts ...
  • Control of Q-factor in nanobeam cavities on substrate 

    Panettieri, Danilo; O'Faolain, Liam; Grande, Marco (IEEE, 2016-08-23) - Conference item
    In this paper, we demonstrate how to efficiently control the quality factor of silicon nitride nanobeam cavities, grown on a silica substrate and embedded in an upper cladding, by engineering the nanobeam cross-section and ...
  • Controlling the gain contribution of background emitters in few-quantum-dot microlasers 

    Gericke, F; Segnon, M; von Helversen, M.M.; Hopfmann, M; Heindel, T; Schneider, C; Höfling, Sven; Kamp, M; Musiał, A; Porte, X; Gies, C; Reitzenstein, S (2018-02) - Journal article
    We provide experimental and theoretical insight into single-emitter lasing effects in a quantum dot (QD)-microlaser under controlled variation of background gain provided by off-resonant discrete gain centers. For that ...
  • Correct Brillouin zone and electronic structure of BiPd 

    Yaresko, Alexander; Schnyder, Andreas P.; Benia, Hadj M.; Yim, Chi-Ming; Levy, Giorgio; Damascelli, Andrea; Ast, Christian R.; Peets, Darren C.; Wahl, Peter (2018-02-15) - Journal article
    A promising route to the realization of Majorana fermions is in noncentrosymmetric superconductors, in which spin-orbit coupling lifts the spin degeneracy of both bulk and surface bands. A detailed assessment of the ...
  • Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert 

    Trainer, Christopher William James; Yim, Chi Ming; McLaren, Martin; Wahl, Peter (2017-09) - Journal article
    Spin-polarized scanning tunneling microscopy (SP-STM) performed in vector magnetic fields promises atomic scale imaging of magnetic structure, providing complete information on the local spin texture of a sample in three ...
  • Designing spin-channel geometries for entanglement distribution 

    Levi, Elliott Kendrick; Kirton, Peter George; Lovett, Brendon William (2016-09-01) - Journal article
    We investigate different geometries of spin-1/2 nitrogen impurity channels for distributing entanglement between pairs of remote nitrogen vacancy centers (NVs) in diamond. To go beyond the system size limits imposed by ...
  • Development and testing of impregnated La0.20Sr0.25Ca0.45TiO3 anode microstructures for solid oxide fuel cells 

    Price, Robert; Cassidy, Mark; Schuler, J. Andreas; Mai, Andreas; Irvine, John T. S. (Electrochemical Society, 2017) - Conference item
    The A-site deficient perovskite: La0.20Sr0.25Ca0.45TiO3 (LSCTA-) is a mixed ionic and electronic conductor (MIEC) which shows promising performance as a Solid Oxide Fuel Cell (SOFC) anode ‘backbone’ material, when impregnated ...
  • Dissipatively coupled waveguide networks for coherent diffusive photonics 

    Mukherjee, Sebabrata; Mogilevtsev, Dmitri; Slepyan, Gregory Ya.; Doherty, Thomas H.; Thomson, Robert R.; Korolkova, Natalia (2017-12-04) - Journal article
    A photonic circuit is generally described as a structure in which light propagates by unitary exchange and transfers reversibly between channels. In contrast, the term ‘diffusive’ is more akin to a chaotic propagation in ...
  • Driven-dissipative spin chain model based on exciton-polariton condensates 

    Sigurdsson, H.; Ramsay, A. J.; Ohadi, H.; Rubo, Y. G.; Liew, T. C.H.; Baumberg, J. J.; Shelykh, I. A. (2017-10-15) - Journal article
    An infinite chain of driven-dissipative condensate spins with uniform nearest-neighbor coherent coupling is solved analytically and investigated numerically. Above a critical occupation threshold the condensates undergo ...
  • Efficient real-time path integrals for non-Markovian spin-boson models 

    Strathearn, Aidan; Kirton, Peter George; Lovett, Brendon William (2017-09) - Journal article
    Strong coupling between a system and its environment leads to the emergence of non-Markovian dynamics, which cannot be described by a time-local master equation. One way to capture such dynamics is to use numerical real-time ...
  • Efficient single photon collection using a μ-fiber-coupled microcavity 

    Lee, Chang Min; Lim, Hee Jin; Schneider, Christian; Maier, Sebastian; Höfling, Sven; Kamp, Martin; Lee, Yong Hee (IEEE, 2016-01-07) - Conference item
    Efficient single photon collection is demonstrated based on a μ-fiber-coupled photonic crystal cavity. 249 kHz of single photons are detected, and estimated single photon count rate (overall collection efficiency) is 20 ...
  • Efficient stray-light suppression for resonance fluorescence in quantum dot-micropillars using self-aligned metal apertures 

    Hopfmann, Caspar; Musial, Anna; Maier, Sebastian; Emmerling, Monika; Schneider, Christian; Hoefling, Sven; Kamp, Martin; Reitzenstein, Stephan (2016-09) - Journal article
    Within this work we propose and demonstrate a technological approach to efficiently suppress excitation laser stray-light in resonance fluorescence experiments on quantum dot-micropillars. To ensure efficient stray-light ...
  • Elastomer based electrically tunable, optical microcavities 

    Slowik, Irma; Kronenberg, Nils Michael; Franke, Markus; Fischer, Axel; Richter, Andreas; Gather, Malte Christian; Leo, Karl (2016-10-26) - Journal article
    Tunable optical elements are mostly realized by microelectromechanical systems, which require expensive and complex lithography during processing. We demonstrate an alternative device based on an electrically tunable ...
  • Electrical pumping and tuning of exciton-polaritons in carbon nanotube microcavities 

    Graf, Arko; Held, Martin; Zakharko, Yuriy; Tropf, Laura Christine; Gather, Malte Christian; Zaumseil, Jana (2017-09) - Journal article
    Exciton-polaritons are hybrid light–matter particles that form upon strong coupling of an excitonic transition to a cavity mode. As bosons, polaritons can form condensates with coherent laser-like emission. For organic ...