Hernandez-Serrano, A. I., Daniel M. Mittleman, and Emma Pickwell-MacPherson. "Broadband amplitude, frequency, and polarization splitter for terahertz frequencies using parallel-plate waveguide technology." Optics Letters 45, no. 5 (2020): 1208-1211.
In this Letter, we report a broadband frequency/polarization
demultiplexer based on parallel-plate waveguides (PPWGs)
for terahertz (THz) frequencies. The fabrication and
experimental validation of this polarization sensitive
demultiplexer is demonstrated for the range from 0.2 to
1 THz. Upgrading the demultiplexer by adding a second
demultiplexer stage, a fifty-fifty amplitude splitter is also
demonstrated in the same frequency range. The multiplexer
is based on a stainless-steel traveling-wave antenna, exhibiting strong mechanical robustness. This unique device
exhibits three splitting mechanisms in the same device:
amplitude, polarization, and frequency splitting. This is
a significant improvement for the next generation of THz
passive components for communication purposes.
"To characterize the proposed demultiplexer, we use the
Terapulse 4000 THz-TDS spectrometer from
TeraView Ltd.
with a spectral resolution of 4.5 GHz in the configuration shown
in Fig. 2. This setup allows for the angle variation between the
exit face of the demultiplexer and the receiver. An aperture size
of 2.5 mm is placed in front of the receiver in order to improve
the spatial resolution. In this Letter, we study two demultiplexers with two different values of the plate spacing in order to
highlight the tunability of the device. In Fig. 3, the experimental
results for the two demultiplexers are presented for both TE1
and TEM modes. "
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