Now showing items 62-81 of 918

  • Blue, surface-emitting, distributed feedback polyfluorene lasers 

    Heliotis, G.; Xia, R.; Bradley, D. D. C.; Turnbull, G. A.; Samuel, I. D. W.; Andrew, P.; Barnes, William L. (American Institute of Physics, 2003)
    We report the fabrication of optically-pumped solid-state distributed feedback lasers utilizing two blue-light-emitting semiconducting polyfluorenes as gain media. The lasers were readily fabricated by solution deposition ...
  • Boundary-layer effects on acoustic transmission through narrow slit cavities 

    Ward, GP; Lovelock, RK; Murray, AR; Hibbins, Alastair P.; Sambles, J. Roy; Smith, JD (American Physical Society, 2015-07-21)
    We explore the slit-width dependence of the resonant transmission of sound in air through both a slit array formed of aluminum slats and a single open-ended slit cavity in an aluminum plate. Our experimental results accord ...
  • Bright-white beetle scales optimise multiple scattering of light 

    Burresi, M; Cortese, L; Pattelli, L; Kolle, M; Vukusic, P; Wiersma, DS; Steiner, U; Vignolini, S (Nature Publishing Group, 2014)
    Whiteness arises from diffuse and broadband reflection of light typically achieved through optical scattering in randomly structured media. In contrast to structural colour due to coherent scattering, white appearance ...
  • The Brightest Young Star Clusters in NGC 5253 

    Calzetti, D; Johnson, KE; Adamo, A; Gallagher III, JS; Andrews, JE; Smith, LJ; Clayton, GC; Lee, JC; Sabbi, E; Ubeda, L; Kim, H; Ryon, JE; Thilker, D; Bright, SN; Zackrisson, E; Kennicutt, RC; Mink, SED; Whitmore, BC; Aloisi, A; Chandar, R; Cignoni, M; Cook, D; Dale, DA; Elmegreen, BG; Elmegreen, DM; Evans, AS; Fumagalli, M; Gouliermis, DA; Grasha, K; Grebel, EK; Krumholz, MR; Walterbos, R; Wofford, A; Brown, TM; Christian, C; Dobbs, C; Herrero, A; Kahre, L; Messa, M; Nair, P; Nota, A; Oestlin, G; Pellerin, A; Sacchi, E; Schaerer, D; Tosi, M (American Astronomical Society, 2015-09-24)
    The nearby dwarf starburst galaxy NGC5253 hosts a number of young, massive star clusters, the two youngest of which are centrally concentrated and surrounded by thermal radio emission (the `radio nebula'). To investigate ...
  • Preparation of Extracellular Matrix Protein Fibers for Brillouin Spectroscopy 

    Edginton, RS; Mattana, S; Caponi, S; Fioretto, D; Green, E; Winlove, CP; Palombo, F (Journal of Visualized Experiments (JoVE), 2016-09-15)
    Brillouin spectroscopy is an emerging technique in the biomedical field. It probes the mechanical properties of a sample through the interaction of visible light with thermally induced acoustic waves or phonons propagating ...
  • Broad-band polarization conversion from a finite periodic structure in the microwave regime 

    Hallam, B. T.; Lawrence, Christopher R.; Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    A reflection grating demonstrating extraordinarily broad-band polarization conversion in a nondiffractive regime has been studied at microwave frequencies. This single-element structure has been fabricated by electrolessly ...
  • Broadband and broadangle extraordinary acoustic transmission through subwavelength apertures surrounded by fluids 

    Carretero-Palacios, S.; Murray, Alasdair R.J.; Martín-Moreno, L.; Hibbins, Alastair P. (IOP Publishing for Deutsche Physikalische Gesellschaft, 2014)
    We present a mechanism for ultra-broadband transmission of acoustic waves through subwavelength hole arrays. Different fluids surrounding (or filling) the holes are considered, which allows tuning of the band of maximum ...
  • Broadband and low loss high refractive index metamaterials in the microwave regime 

    Campbell, T.; Hibbins, Alastair P.; Sambles, J. Roy; Hooper, Ian R. (American Institute of Physics, 2013)
    A broadband, low-loss, isotropic, high refractive index metamaterial comprising an array of close-packed cubic elements of cross-linked square metal plates is demonstrated in the microwave regime. The structuring of the ...
  • Broadband impedance-matched electromagnetic structured ferrite composite in the megahertz range 

    Parke, L.; Youngs, I.J.; Hibbins, Alastair P.; Sambles, J. Roy (American Institute of Physics (AIP), 2014)
    A high refractive-index structured ferrite composite is designed to experimentally demonstrate broadband impedance matching to free-space. It consists of an array of ferrite cubes that are anisotropically spaced, thereby ...
  • Brown dwarfs and very low mass stars in the Hyades cluster : a dynamically evolved mass function 

    Bouvier, Jerome; Kendall, T.R.; Meeus, G.; Testi, L.; Moraux, E.; Stauffer, J.R.; James, D.; Cuillandre, J.C.; Irwin, J.; McCaughrean, M.J.; Baraffe, I.; Bertin, E. (EDP Sciences for European Southern Observatory (ESO), 2008)
    We conducted a search for brown dwarfs (BDs) and very low mass (VLM) stars in the 625 Myr-old Hyades cluster in order to derive the cluster's mass function across the stellar-substellar boundary. We performed a deep (I=23, ...
  • Building a better future: An exploration of beliefs about climate change and perceived need for adaptation within the building industry 

    Morton, Thomas A.; Bretschneider, Pamela; Coley, David; Kershaw, Tristan (Elsevier, 2011)
    The present research explored beliefs about climate change among an important yet relatively understudied population: representatives of the building industry. We also assessed the perceived adequacy of current climate-related ...
  • Can lasing at visible wavelengths be achieved using the low-loss long-range surface plasmon-polariton mode? 

    Winter, G.; Wedge, S.; Barnes, William L. (Institute of Physics and Deutsche Physikalische Gesellschaft, 2006)
    The use of emissive dye molecules as a gain medium in order to excite the low-loss long-range surface plasmon-polariton (SPP) mode on a thin silver film has previously been suggested as a method of achieving SPP lasing at ...
  • Can non-ideal magnetohydrodynamics solve the magnetic braking catastrophe? 

    Wurster, J; Price, DJ; Bate, Matthew R. (Oxford University Press (OUP), 2016-01-11)
    We investigate whether or not the low ionization fractions in molecular cloud cores can solve the 'magnetic braking catastrophe', where magnetic fields prevent the formation of circumstellar discs around young stars.We ...
  • Canonical quantization of electromagnetism in spatially dispersive media 

    Horsley, S.A.R.; Philbin, Thomas G. (IOP Publishing, 2014)
    We find the action that describes the electromagnetic field in a spatially dispersive, homogeneous medium. This theory is quantized and the Hamiltonian is diagonalized in terms of a continuum of normal modes. It is found ...
  • Canonical quantization of electromagnetism in spatially dispersive media 

    Horsley, S.A.R.; Philbin, Thomas G. (IOP Publishing, 2014)
    We find the action that describes the electromagnetic field in a spatially dispersive, homogeneous medium. This theory is quantized and the Hamiltonian is diagonalized in terms of a continuum of normal modes. It is found ...
  • Canonical quantization of macroscopic electromagnetism 

    Philbin, Thomas G. (Institute of Physics, 2010)
    Application of the standard canonical quantization rules of quantum field theory to macroscopic electromagnetism has encountered obstacles due to material dispersion and absorption. This has led to a phenomenological ...
  • Canonical quantization of the electromagnetic field interacting with a moving dielectric medium 

    Horsley, S.A.R. (American Physical Society, 2012)
    The electromagnetic field is canonically quantized in the presence of a linear, dispersive, and dissipative medium that is in uniform motion. Specifically we calculate the change in the normal modes of the coupled matter-field ...
  • Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy 

    Ulbricht, Ronald; Hendry, Euan; Shan, Jie; Heinz, Tony F.; Bonn, Mischa (American Physical Society, 2011)
    Time-resolved, pulsed terahertz spectroscopy has developed into a powerful tool to study charge carrier dynamics in semiconductors and semiconductor structures over the past decades. Covering the energy range from a few ...
  • Cascaded Optical Field Enhancement in Composite Plasmonic Nanostructures 

    Kravets, V.G.; Zoriniants, George; Burrows, Christopher P.; Schedin, F.; Casiraghi, C.; Klar, P.; Geim, A.K.; Barnes, William L.; Grigorenko, A.N. (American Physical Society, 2010)
    We present composite plasmonic nanostructures designed to achieve cascaded enhancement of electromagnetic fields at optical frequencies. Our structures were made with the help of electron-beam lithography and comprise a ...
  • Casimir effect from macroscopic quantum electrodynamics 

    Philbin, Thomas G. (Institute of Physics, 2011)
    The canonical quantization of macroscopic electromagnetism was recently presented in New J. Phys. 12 (2010) 123008. This theory is here used to derive the Casimir effect, by considering the special case of thermal and ...