
Synthesized All-Pass Waveguide for Ultrafast Electronics
Desong Wang, Ke Wu
Engineering ›› 2023, Vol. 30 ›› Issue (11) : 49-54.
Synthesized All-Pass Waveguide for Ultrafast Electronics
Ultrashort pulse transmission has been recognized as a primary problem that fundamentally hinders the development of ultrafast electronics beyond the current nanosecond timescale. This requires a transmission line or waveguide that exhibits an all-pass frequency behavior for the transmitted ultrashort pulse signals. However, this type of waveguiding structure has not yet been practically developed; groundbreaking innovations and advances in signal transmission technology are urgently required to address this scenario. Herein, we present a synthesized all-pass waveguide that demonstrates record guided-wave controlling capabilities, including eigenmode reshaping, polarization rotation, loss reduction, and dispersion improvement. We experimentally developed two waveguides for use in ultrabroad frequency ranges (direct current (DC)-to-millimeter-wave and DC-to-terahertz). Our results suggest that the waveguides can efficiently transmit picosecond electrical pulses while maintaining signal integrity. This waveguide technology is an important breakthrough in the evolution of ultrafast electronics, providing a path towards frequency-engineered ultrashort pulses for low-loss and low-dispersion transmissions.
All-pass waveguide / Ultrashort pulse / Picosecond transmission / Ultrafast electronics / Terahertz technology / Mode-selective transmission line
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We thank David Dousset for helping with the measurements at the terahertz probe station and Louis-Philippe Carignan for capturing the scanning electron microscope images. We are grateful to the technical staff of the Poly-Grames Research Center at Polytechnique Montreal for the circuit fabrication. We thank Sarah Wu Martinez for language editing. Desong Wang acknowledges discussions with Ben You, Muhibur Rahman, and Louis-Philippe Carignan. This study was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant and in part by the NSERC-Huawei Industrial Research Chair Program.
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