title: Optimum excitation conditions for the generation of high-electric-field terahertz radiation from an oscillator-driven photoconductive device.
abstract: We report the impulsive generation of terahertz (THz) radiation with a field amplitude of more than 1.5 kV/cm at megahertz repetition rates, using an interdigitated photoconducting device. The approach provides an average THz power of 190 microW, corresponding to an optical-to-THz conversion efficiency of 2.5 x 10(-4). Optimum conditions are achieved when the excitation spot size is of the order of the THz wavelength.
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, Dresden, Germany. a.dreyhaupt@fz-rossendorf.de
authors.forename: André
authors.initials: A
authors.lastname: Dreyhaupt
authors.forename: Stephan
authors.initials: S
authors.lastname: Winnerl
authors.forename: Manfred
authors.initials: M
authors.lastname: Helm
authors.forename: Thomas
authors.initials: T
authors.lastname: Dekorsy