Now showing items 1-20 of 36

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Half adder capabilities of a coupled quantum dot device 

    Pfeffer, P; Hartmann, F; Neri, I; Schade, A; Emmerling, M; Kamp, M; Gammaitoni, L; Hoefling, Sven; Worschech, L (2016-05-27) - Journal article
    In this paper we demonstrate two realizations of a half adder based on a voltage-rectifying mechanism involving two Coulomb-coupled quantum dots. First, we examine the ranges of operation of the half adder's individual ...
  • High-energy side-peak emission of exciton-polariton condensates in high density regime 

    Horikiri, Tomoyuki; Yamaguchi, Makoto; Kamide, Kenji; Matsuo, Yasuhiro; Byrnes, Tim; Ishida, Natsuko; Löffler, Andreas; Hoefling, Sven; Shikano, Yutaka; Ogawa, Tetsuo; Forchel, Alfred; Yamamoto, Yoshihisa (2016-05-19) - Journal article
    In a standard semiconductor laser, electrons and holes recombine via stimulated emission to emit coherent light, in a process that is far from thermal equilibrium. Exciton-polariton condensates -- sharing the same basic ...
  • Holographic optical traps for atom-based topological Kondo devices 

    Buccheri, Francesco; Bruce, Graham David; Trombettoni, Andrea; Cassettari, Donatella; Babujian, Hrachya; Korepin, Vladimir E; Sodano, Pasquale (2016-07-14) - Journal article
    The topological Kondo (TK) model has been proposed in solid-state quantum devices as a way to realize non-Fermi liquid behaviors in a controllable setting. Another motivation behind the TK model proposal is the demand to ...
  • Hydrodynamic electron flow and Hall viscosity 

    Scaffidi, Thomas; Nandi, Nabhanila; Schmidt, Burkhard; Mackenzie, Andrew P.; Moore, Joel E. (2017-06-02) - Journal article
    In metallic samples of small enough size and sufficiently strong momentum-conserving scattering, the viscosity of the electron gas can become the dominant process governing transport. In this regime, momentum is a long-lived ...
  • IEEE 802.11ac MU-MIMO Wireless LAN cells with legacy clients 

    Abu-Tair, Mamoun; Bhatti, Saleem Noel (Institute of Electrical and Electronics Engineers Inc., 2017-03-27) - Conference item
    We provide an empirical evaluation of an IEEE 802.11ac Wireless LocalArea Network (WLAN) cell with Multiple User Multiple Input MultipleOutput (MU-MIMO) technology. We conducted our experiments on a testbed comprising ...
  • Impact of cell load on 5GHz IEEE 802.11 WLAN 

    Abu-Tair, Mamoun; Bhatti, Saleem Noel (Institute of Electrical and Electronics Engineers Inc., 2017-03-27) - Conference item
    We have conducted an empirical study of the latest 5GHz IEEE 802.11 wireless LAN (WLAN) variants of 802.11n (5GHz) and 802.11ac (Wave 1), under different cell load conditions. We have considered typical configurations of ...