Now showing items 140-143 of 143

  • 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 ...
  • Ultrafast optical switching of the THz transmission through metallic subwavelength hole arrays 

    Hendry, Euan; Lockyear, Matthew J.; Gómez Rivas, J.; Kuipers, L.; Bonn, Mischa (American Physical Society, 2007)
    We demonstrate ultrafast optical switching of the transmission of terahertz radiation through a metal grating with subwavelength holes. By fabricating the grating on a semiconductor silicon substrate, we are able to control ...
  • Voltage dependent director of a homeotropic negative liquid crystal cell 

    Ruan, Lizhen; Yang, Fuzi; Sambles, J. Roy (American Institute of Physics, 2008)
    Thin layers of obliquely (60° to normal) thermally evaporated SiOx lead to homeotropic alignment of a nematic liquid crystal (LC) having negative dielectric anisotropy. Under application of an ac voltage the director, as ...
  • Waveguide arrays as plasmonic metamaterials: transmission below cutoff 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2006)
    Since the work of Ebbesen et al. [Nature (London) 391, 667 (1998)], there has been immense interest in the optical properties of subwavelength holes in metal layers. While the enhanced transmission observed is generally ...