Active Terahertz Two-wire Waveguides

Abstract

Abstract:We demonstrate, by generating a THz electric field directly within the guiding structure, an active two-wire waveguide operating in the terahertz (THz) range of wavelengths. We compare the energy throughput of the active configuration with that of a radiatively coupled semi-large photoconductive antenna, in which the radiation is generated outside the waveguide, reporting a 60 times higher energy throughput for the same illumination power and applied voltage. This novel, active waveguide design allows to have efficient coupling of the THz radiation in a dispersion-less waveguide without the need of involved radiative coupling geometries.

Versatile metal-wire waveguides for broadband terahertz signal processing and multiplexing

“…To mount the wires 22 , two PMMA slabs with holes were used to hold and support them. The diameter of the holes was set to 1037 µm in order to guarantee that the gap size between wires was 300 µm in each direction.…”

“…The underlying reason is that the modal energy is tightly confined in the wavelength-scale space between the two wires 10 , which limits the possible ways to manipulate the propagating THz waves. While Bragg gratings, considered among the most fundamental processing units, have been realized in TWWGs, they typically rely on a hybrid approach that requires inserting standalone metalized papers 20,21 or dielectric gratings 22 into the waveguides. This, in turn, severely hampers the realization of more sophisticated devices and complex processing functionalities.…”

A New Analytical Method for Studying Higher Order Modes of a Two-Wire Transmission Line

“…It has been demonstrated both experimentally and numerically that two-wire waveguide can be used at THz frequency region successfully with many advantages such as no dispersion, low loss, easy fabrication, and good coupling with common THz sources [3][4][5][6][7][8]. Besides, there have been lots of work based on this type of waveguide which shows its high importance in microwave and THz frequencies [9][10][11][12][13][14]. From the point of view of physics, theoretical studies on two-wire waveguide have been based on traditional electrostatic methods, such as image method, distributed parameter theory with equivalent L and C parameters, mapping approach, and approximate field analysis [15][16][17][18][19].…”