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.
Highlights
Terahertz (THz) radiation allows for analysis of various properties of materials, including for example electronic states in semiconductors, dielectric properties of glasses and plastics, and vibrational modes of crystals [1, 2]
We investigate field enhancement properties of a tapered parallel plate waveguide for ultrashort terahertz (THz) pulses
Zhan et al [13] demonstrated that a tapered parallel plate waveguide (TPPWG) supports superfocusing of THz waves below λ /250
Summary
Terahertz (THz) radiation allows for analysis of various properties of materials, including for example electronic states in semiconductors, dielectric properties of glasses and plastics, and vibrational modes of crystals [1, 2]. Two independent experimental methods, free-space electro-optic sampling (FSEOS) and air biased coherent detection (ABCD), are used to measure the THz electric field at the output of the waveguide. For the open gaps the major part of the THz wave propagates through the gap and dominates the pictures These strong bursts of THz radiation, even for output gaps that are more than one order of magnitude smaller than the THz wavelength, indicate that high THz intensities are focused well below the diffraction limit
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