Now showing items 1-20 of 41

  • All-Optical Generation of Surface Plasmons in Graphene 

    Constant, Thomas J.; Hornett, Samuel M.; Chang, D.E.; Hendry, Euan (Cornell University, 2015-05-01)
    Here we present an all-optical plasmon coupling scheme, utilising the intrinsic nonlinear optical response of graphene. We demonstrate coupling of free-space, visible light pulses to the surface plasmons in a planar, ...
  • 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 ...
  • 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 ...
  • Control of the stop band of an acoustic double fishnet 

    Murray, Alasdair R.J.; Hendry, Euan; Summers, I.R.; Sambles, J. Roy; Hibbins, Alastair P. (Journal of the Acoustical Society of America, 2013)
    The acoustic transmittance of two closely spaced solid plates, each perforated with a square array of cylindrical holes, exhibits a band of near-perfect acoustic attenuation originating from hybridization between a resonance ...
  • Controlling the generation of THz radiation from metallic films using periodic microstructure 

    Polyushkin, Dmitry K.; Hendry, Euan; Barnes, William L. (Springer Verlag, 2015-04-05)
    We report on THz frequency generation via irradiation of microstructured semicontinuous silver films by femtosecond laser pulses. By patterning the film so as to produce an array of microstrips, we show that one can use ...
  • 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. ...
  • Hot phonon decay in supported and suspended exfoliated graphene 

    Hale, Peter J.; Hornett, Samuel M.; Moger, Julian; Horsell, D.W.; Hendry, Euan (American Physical Society, 2011-03-14)
    Near infrared pump-probe spectroscopy has been used to measure the ultrafast dynamics of photoexcited charge carriers in monolayer and multilayer graphene. We observe two decay processes occurring on 100 fs and 2 ps ...
  • 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 ...
  • Low acoustic transmittance through a holey structure 

    Bell, James S.; Summers, I.R.; Murray, Alasdair R.J.; Hendry, Euan; Sambles, J. Roy; Hibbins, Alastair P. (American Physical Society, 2012)
    The “acoustic double fishnet” is a structure with holes running from its front to back faces, yet at a characteristic frequency it transmits very little sound. The transmittance of this structure, which is comprised of a ...
  • Mechanisms of THz generation from silver nanoparticle and nanohole arrays illuminated by 100 fs pulses of infrared light 

    Polyushkin, Dmitry K.; Marton, I.; Racz, P.; Dombi, P.; Hendry, Euan; Barnes, William L. (American Physical Society, 2014)
    We study THz pulses generated from plasmonic metal nanostructures under femtosecond illumination of near-IR light. We find two regimes of excitation, according to the order of the dependence of the THz fluence on the ...
  • Microwave response of hole and patch arrays 

    Taylor, Melita C.; Edmunds, James D.; Hendry, Euan; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2010)
    The electromagnetic response of two-dimensional square arrays of perfectly conducting square patches, and their complementary structures, is modeled utilizing a modal matching technique and employing Babinet’s principle. ...
  • Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning 

    Mikhaylovskiy, Rostislav; Hendry, Euan; Kruglyak, V.V. (American Physical Society, 2010)
    We report a theory of the effective permeability of multilayered metamaterials containing thin ferromagnetic layers with magnetization pinned on either one or both surfaces. Because of the pinning and small film thickness, ...
  • Nonlinear resistivity and heat dissipation in monolayer graphene 

    Price, A.S.; Hornett, Samuel M.; Shytov, A.V.; Hendry, Euan; Horsell, D.W. (American Physical Society, 2012)
    We have experimentally studied the nonlinear nature of electrical conduction in monolayer graphene devices on silica substrates. This nonlinearity manifests itself as a nonmonotonic dependence of the differential resistance ...