title: Terahertz field enhancement to the MV/cm regime in a tapered parallel plate waveguide.
abstract: We investigate field enhancement properties of a tapered parallel plate waveguide for ultrashort terahertz (THz) pulses. We use two independent methods, air biased coherent detection inside the waveguide and free-space electro-optic sampling, respectively, which enables a calibrated, quantitative measurement of the field strength at the output of the waveguide. Field enhancement factors greater than 20 are demonstrated and record-high field strengths of > 1.4 MV/cm are reached. We find an excellent agreement between the two independent methods of field measurement and a numerical 3D full-vectorial time-domain simulations.
authors.affiliation: DTU Fotonik, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. kiwa@fotonik.dtu.dk
authors.forename: K
authors.initials: K
authors.lastname: Iwaszczuk
authors.forename: A
authors.initials: A
authors.lastname: Andryieuski
authors.forename: A
authors.initials: A
authors.lastname: Lavrinenko
authors.forename: X-C
authors.initials: XC
authors.lastname: Zhang
authors.forename: P U
authors.initials: PU
authors.lastname: Jepsen