Now showing items 1-20 of 49

  • 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 ...
  • 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 ...
  • Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert 

    Trainer, Christopher William James; Yim, Chi Ming; McLaren, Martin; Wahl, Peter (2017-09-07) - Journal article
  • 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 ...
  • 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 ...
  • Emergent Weyl fermion excitations in TaP explored by 181Ta quadrupole resonance 

    Yasuoka, H.; Kubo, T.; Kishimoto, Y.; Kasinathan, D.; Schmidt, M.; Yan, B.; Zhang, Y.; Tou, H.; Felser, C.; Mackenzie, A. P.; Baenitz, M. (2017-06-09) - Journal article
    The 181Ta quadrupole resonance [nuclear quadrupole resonance (NQR)] technique is utilized to investigate the microscopic magnetic properties of the Weyl semimetal TaP. We find three zero-field NQR signals associated with ...
  • Emission from quantum-dot high-β microcavities : transition from spontaneous emission to lasing and the effects of superradiant emitter coupling 

    Kreinberg, Sören; Chow, Weng W.; Wolters, Janik; Schneider, Christian; Gies, Christopher; Jahnke, Frank; Höfling, Sven; Kamp, Martin; Reitzenstein, Stephan (2017-08) - Journal article
    Measured and calculated results are presented for the emission properties of a new class of emitters operating in the cavity quantum electrodynamics regime. The structures are based on high-finesse GaAs/AlAs micropillar ...
  • Enhanced nonlinear refractive index in ε-near-zero materials 

    Caspani, L; Kaipurath, R P M; Clerici, M; Ferrera, M; Roger, T; Kim, J; Kinsey, N; Pietrzyk, Monika; Di Falco, Andrea; Shalaev, V M; Boltasseva, A; Faccio, D (2016-06-10) - Journal item
    New propagation regimes for light arise from the ability to tune the dielectric permittivity to extremely low values. Here we demonstrate a universal approach based on the low linear permittivity values attained in the ...
  • Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity 

    Brodbeck, S.; De Liberato, S.; Amthor, M.; Klaas, M.; Kamp, M.; Worschech, L.; Schneider, C.; Höfling, Sven (2017-07-14) - Journal article
    The dipole coupling strength g between cavity photons and quantum well excitons determines the regime of light matter coupling in quantum well-microcavities. In the strong coupling regime, a reversible energy between exciton ...
  • Facilitating a well-founded approach to autonomic systems 

    Dobson, Simon (IEEE Computer Society, 2008-04) - Conference item
    While it is desirable for all computing and communications systems to have well-defined and verifiable behaviour, autonomic systems must additionally guarantee that their adaptive behaviour is correct, both in the sense ...
  • Giant photon bunching, superradiant pulse emission, and excitation trapping in quantum-dot nanolasers 

    Jahnke, Frank; Gies, Christopher; Aßmann, Marc; Bayer, Manfred; Leymann, H A M; Foerster, Alexander; Wiersig, Jan; Schneider, Christian; Kamp, Martin; Hoefling, Sven (2016-05-10) - Journal article
    Light is often characterized only by its classical properties, like intensity or coherence. When looking at its quantum properties, described by photon correlations, new information about the state of the matter generating ...