Now showing items 1-20 of 21

  • Determining the terahertz optical properties of subwavelength films using semiconductor surface plasmons 

    Isaac, Thomas Henry; Barnes, William L.; Hendry, Euan (American Institute of Physics, 2008)
    By employing a combination of time-domain measurements and numerical calculations, we demonstrate that the semiconductor InSb supports a strongly confined surface plasmon (SP) in the terahertz frequency range. We show that ...
  • Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots 

    Hendry, Euan; Koeberg, Mattijs; Wang, F.; Zhang, H.; de Mello Donegá, C.; Vanmaekelbergh, D.; Bonn, Mischa (American Physical Society, 2006)
    We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots. Time-resolved luminescence and terahertz spectroscopy reveal that the rate of hole cooling, following photoexcitation ...
  • Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer 

    Hendry, Euan; Schins, Juleon M.; Candeias, L. P.; Siebbeles, L. D. A.; Bonn, Mischa (American Physical Society, 2004)
    We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge ...
  • Electron transport in TiO2 probed by THz time-domain spectroscopy 

    Hendry, Euan; Wang, F.; Shan, Jie; Heinz, Tony F.; Bonn, Mischa (American Physical Society, 2004)
    Electron transport in crystalline TiO2 (rutile phase) is investigated by frequency-dependent conductivity measurements using THz time-domain spectroscopy. Transport is limited by electron-phonon coupling, resulting in a ...
  • Exciton and electron-hole plasma formation dynamics in ZnO 

    Hendry, Euan; Koeberg, Mattijs; Bonn, Mischa (American Physical Society, 2007)
    We employ optical pump-THz probe measurements to study the formation of excitons and electron-hole plasmas following photogeneration of a hot electron-hole gas in the direct gap semiconductor zinc oxide. Below the Mott ...
  • High-frequency dielectric relaxation of liquid crystals: THz time-domain spectroscopy of liquid crystal colloids 

    Oh-e, Masahito; Yokoyama, Hiroshi; Koeberg, Mattijs; Hendry, Euan; Bonn, Mischa (Optical Society of America, 2006)
    Terahertz time-domain spectroscopy has been used to study the dielectric relaxation of pure 4’–n-pentyl–4–cyanobiphenyl (5CB) liquid crystal (LC) and its mixtures with 10 µm SiO2 particles in the frequency range 0.2–2 THz. ...
  • Importance of diffraction in determining the dispersion of designer surface plasmons 

    Hendry, Euan; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2008)
    By employing a modified modal matching approach, we obtain explicit analytical expressions relating frequency to in-plane wave vector for the surface electromagnetic mode confined at the interface between vacuum and a ...
  • Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution 

    Hendry, Euan; Koeberg, Mattijs; Schins, Juleon M.; Nienhuys, H. K.; Sundström, V.; Siebbeles, L. D. A.; Bonn, Mischa (American Physical Society, 2005)
    We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain ...
  • Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays 

    Parsons, J.; Hendry, Euan; Burrows, Christopher P.; Auguié, Baptiste; Sambles, J. Roy; Barnes, William L. (American Physical Society, 2009)
    We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through ...
  • On the mechanism of charge transport in pentacene 

    van Laarhoven, Hendrik A.; Flipse, Cees F. J.; Koeberg, Mattijs; Bonn, Mischa; Hendry, Euan; Orlandi, G.; Jurchescu, O. D.; Palstra, T. T. M.; Troisi, A. (American Institute of Physics, 2008)
    Terahertz transient conductivity measurements are performed on pentacene single crystals, which directly demonstrate a strong coupling of charge carriers to low frequency molecular motions with energies centered around 1.1 ...
  • Optical Control over Surface-Plasmon-Polariton-Assisted THz Transmission through a Slit Aperture 

    Hendry, Euan; Garcia-Vidal, F. J.; Martin-Moreno, L.; Gómez Rivas, J.; Bonn, Mischa; Hibbins, Alastair P.; Lockyear, Matthew J. (American Physical Society, 2008)
    We demonstrate optical control over the transmission of terahertz (THz) radiation through a single subwavelength slit in an otherwise opaque silicon wafer. The addition of periodic corrugation on each side of the wafer ...
  • Photo-induced doping and strain in exfoliated graphene 

    Alexeev, Eugene; Moger, Julian; Hendry, Euan (American Institute of Physics, 2013)
    The modification of single layer graphene due to intense, picoseconds near-infrared laser pulses is investigated. We monitor the stable changes introduced to graphene upon photoexcitation using Raman spectroscopy. We find ...
  • Prism coupling to 'designer' surface plasmons 

    Hibbins, Alastair P.; Hendry, Euan; Lockyear, Matthew J.; Sambles, J. Roy (Optical Society of America, 2008)
    The excitation of ‘designer’ surface-plasmon-like modes on periodically perforated metals is demonstrated at microwave frequencies using the classical method of prism coupling. In addition we provide a complete formalism ...
  • Reduction of carrier mobility in semiconductors caused by charge-charge interactions 

    Hendry, Euan; Koeberg, Mattijs; Pijpers, J.; Bonn, Mischa (American Physical Society, 2007)
    We investigate the effect of charge-charge interactions on carrier mobility in titanium dioxide (TiO2) and silicon (Si) using terahertz spectroscopy. Charge scattering times and plasma frequencies are directly determined ...
  • Retrieving the susceptibility from time-resolved terahertz experiments 

    Schins, Juleon M.; Hendry, Euan; Bonn, Mischa; Muller, H. G. (American Institute of Physics, 2007)
    We present an analytical expression for the observed signal in time- and phase-resolved pump-probe studies, with particular emphasis on terahertz time-domain spectroscopy. Maxwell's equations are solved for the response ...
  • Simultaneous ultrafast probing of intramolecular vibrations and photoinduced charge carriers in rubrene using broadband time-domain THz spectroscopy 

    Koeberg, Mattijs; Hendry, Euan; Schins, Juleon M.; van Laarhoven, Hendrik A.; Flipse, Cees F. J.; Reimann, Klaus; Woerner, Michael; Elsaesser, Thomas; Bonn, Mischa (American Physical Society, 2007)
    We determine the ultrafast frequency- and time-resolved complex dielectric responses of photoexcited, single-crystal rubrene in the frequency range of 10–30 THz (330–1000 cm−1) using ultrafast broadband THz spectroscopy. ...
  • Surface plasmon mediated transmission of subwavelength slits at THz frequencies 

    Isaac, Thomas Henry; Gómez Rivas, J.; Sambles, J. Roy; Barnes, William L.; Hendry, Euan (American Physical Society, 2008)
    We present measurements and a numerical modeling that elucidate the role of surface plasmons in the resonant transmission of a subwavelength slit in a conducting material. By using THz time domain spectroscopy, we determine ...
  • Transmission of light through periodic arrays of square holes: From a metallic wire mesh to an array of tiny holes 

    Bravo-Abad, J.; Martin-Moreno, L.; Garcia-Vidal, F. J.; Hendry, Euan; Gómez Rivas, J. (American Physical Society, 2007)
    A complete landscape is presented of the electromagnetic coupling between square holes forming a two-dimensional periodic array in a metallic film. By combining both experimental and theoretical results along with a ...
  • Tuneable Fabry–Perot etalon for terahertz radiation 

    Jewell, Sharon A.; Hendry, Euan; Isaac, Thomas Henry; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2008)
    An indium tin oxide-clad liquid crystal filled Fabry–Perot etalon structure has been shown to act as an effective narrow-band filter at terahertz frequencies. An applied voltage, which controls the alignment of the nematic ...
  • Ultrafast charge generation in a semiconducting polymer studied with THz emission spectroscopy 

    Hendry, Euan; Koeberg, Mattijs; Schins, Juleon M.; Siebbeles, L. D. A.; Bonn, Mischa (American Physical Society, 2004)
    We study the ultrafast charge generation in a semiconducting polymer (MEH-PPV) by measuring the radiated THz field after photoexciting the biased polymer with a femtosecond visible pulse. The subpicosecond temporal ...