Improvement of THz coupling using a tapered parallel-plate waveguide

Coupling into tapered metal parallel plate waveguides using a focused terahertz beam

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Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

We study the reflection of terahertz (THz) radiation at the end of a parallel-plate waveguide (PPWG), due to the impedance mismatch between the propagating transverse-electromagnetic mode and the free-space background. We find that, for a PPWG with uniformly spaced plates, the reflection coefficient at the output face increases as the plate separation decreases, consistent with predictions by e...

Terahertz field enhancement to the MV/cm regime in a tapered parallel plate waveguide.

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...

Terahertz Filters by Using Tapered Parallel-Plate Waveguides

We present experimental and finite-difference time-domain simulation studies on high pass filter (HPF) based on transverse electric (TE) mode, low pass filter based (LPF) on multiple slits, and tunable notch-filter based on single slit. The LPF and notch filter are carried out by using the metal slits positioned at the center of the air gaps in tapered parallel-plate waveguides (TPPWG).

Liquids and molecular solids investigated by THz time-domain reflection and parallel-plate waveguide spectroscopy