Now showing items 43-62 of 580

  • 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 ...
  • 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 ...
  • Casimir stress in an inhomogeneous medium 

    Philbin, Thomas G.; Xiong, C.; Leonhardt, Ulf (Elsevier Masson, 2010)
    The Casimir effect in an inhomogeneous dielectric is investigated using Lifshitz's theory of electromagnetic vacuum energy. A permittivity function that depends continuously on one Cartesian coordinate is chosen, bounded ...
  • Characterising stellar micro-variability for planetary transit searches 

    Aigrain, Suzanne; Favata, F.; Gilmore, G. (EDP Sciences, 2004)
    A method for simulating light curves containing stellar micro-variability for a range of spectral types and ages is presented. It is based on parameter-by-parameter scaling of a multi-component fit to the solar irradiance ...
  • Characterization of spin-valves fabricated on opaque substrates by optical ferromagnetic resonance 

    Barman, A.; Kruglyak, V.V.; Hicken, R.J.; Marrows, C.H.; Ali, M.; Hindmarch, A.T.; Hickey, B.J. (American Institute of Physics, 2002)
    We have used a transmission line deposited on a transparent substrate to deliver an optically triggered magnetic field pulse to a spin valve structure deposited upon an opaque substrate. The ensuing ferromagnetic resonance ...
  • Characterization of the Atmosphere of the Hot Jupiter HAT-P-32Ab and the M-dwarf Companion HAT-P-32B 

    Zhao, Ming; O'Rourke, Joseph G.; Wright, Jason T.; Knutson, H.; Burrows, A.S.; Fortney, J.J.; Ngo, Henry; Fulton, Benjamin J.; Baranec, Christoph; Riddle, Reed; Law, Nicholas M.; Muirhead, Philip S.; Hinkley, Sasha; Showman, A.P.; Curtis, Jason; Burruss, Rick (American Astronomical Society / IoP Publishing, 2014)
    We report secondary eclipse photometry of the hot Jupiter HAT-P-32Ab, taken with Hale/Wide-field Infra-Red Camera (WIRC) in H and KS bands and with Spitzer/IRAC at 3.6 and 4.5 μm. We carried out adaptive optics imaging of ...
  • Chemically specific imaging and in-situ chemical analysis of articular cartilage with stimulated Raman scattering 

    Mansfield, Jessica; Moger, Julian; Green, Ellen; Moger, C; Winlove, C. Peter (Wiley-VCH Verlag, 2013-01-10)
    Stimulated Raman scattering (SRS) has been applied to unstained samples of articular cartilage enabling the investigation of living cells within fresh tissue. Hyperspectral SRS measurements over the CH vibrational region ...
  • Chitosan amphiphile coating of peptide nanofibres reduces liver uptake and delivers the peptide to the brain on intravenous administration. 

    Lalatsa, A; Schätzlein, AG; Briggs, M; Godfrey, L; Iannitelli, A; Uchegbu, IF; Garrett, Natalie; Moger, Julian; Freeman, Jay (Elsevier, 2015-01-10)
    The clinical development of neuropeptides has been limited by a combination of the short plasma half-life of these drugs and their ultimate failure to permeate the blood brain barrier. Peptide nanofibres have been used to ...
  • Circularly polarized colour reflection from helicoidal structures in the beetle Plusiotis boucardi 

    Jewell, Sharon A.; Vukusic, Peter; Roberts, N. W. (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    A detailed optical study of the iridescent outer-shell of the beetle Plusiotis boucardi has revealed a novel microstructure which controls both the polarization and wavelength of reflected light. A previously unreported ...
  • Clostridium perfringens epsilon toxin H149A mutant as a platform for receptor binding studies 

    Bokori-Brown, Monika; Kokkinidou, Maria C.; Savva, Christos G.; Fernandes da Costa, Sérgio P.; Naylor, Claire E.; Cole, Ambrose R.; Moss, David S.; Basak, Ajit K.; Titball, Richard W. (Wiley, 2013-05)
    Clostridium perfringens epsilon toxin (Etx) is a pore-forming toxin responsible for a severe and rapidly fatal enterotoxemia of ruminants. The toxin is classified as a category B bioterrorism agent by the U.S. Government ...
  • Clostridium perfringens α-toxin interaction with red cells and model membranes. 

    Jewell, Sharon A.; Titball, Richard W.; Huyet, J; Naylor, Claire E.; Basak, Ajit K.; Gologan, Petre; Winlove, C. Peter; Petrov, Peter G. (Royal Society of Chemistry, 2015-08-18)
    The effects of Clostridium perfringens α-toxin on host cells have previously been studied extensively but the biophysical processes associated with toxicity are poorly understood. The work reported here shows that the ...
  • Coexisting Nematic and Smectic- A Phases in a Twisted Liquid-Crystal Cell 

    Ruan, Lizhen; Osipov, M. A.; Sambles, J. Roy (American Physical Society, 2001)
    Twisted homogeneously planar-aligned nematic liquid-crystal cells are cooled into the smectic- A phase. The expected defective structure does not form. Instead the cells still show good optical-guiding characteristics. ...
  • Coherent nonlinear optical response of graphene 

    Hendry, Euan; Hale, Peter J.; Moger, Julian; Savchenko, A.K.; Mikhailov, S.A. (American Physical Society, 2010)
    We investigate the nonlinear optical properties of graphene flakes using four-wave mixing. The corresponding third-order optical susceptibility is found to be remarkably large and only weakly dependent on the wavelength ...
  • Coherent particle transfer in an on-demand single-electron source 

    Keeling, J.; Shytov, A.V.; Levitov, L.S. (American Physical Society, 2008)
    Electron transfer from a localized state in a quantum dot into a ballistic conductor generally results in particle-hole excitations. We study this effect, considering a resonance level with time-dependent energy coupled ...
  • Coherent phonon modes of crystalline and amorphous Ge2Sb2Te5 thin films: A fingerprint of structure and bonding 

    Shalini, Ashawaraya; Liu, Y.; Katmis, F.; Braun, W.; Srivastava, G.P.; Hicken, R.J. (American Institute of Physics (AIP), 2015)
    Femtosecond optical pump-probe measurements have been made upon epitaxial, polycrystalline, and amorphous thin films of Ge2Sb2Te5 (GST). A dominant coherent optical phonon mode of 3.4 THz frequency is observed in time-resolved ...