Direct phase modulation is one of the most urgent and difficult issues in the terahertz research area. Here, we propose a new method employing a two-dimensional electron gas (2DEG) perturbation microstructure unit coupled to a transmission line to realize high-precision digital terahertz phase manipulation. We induce local perturbation resonances to manipulate the phase of guided terahertz waves. By controlling the electronic transport characteristics of the 2DEG using an external voltage, the strength of the perturbation can be manipulated, which affects the phase of the guided waves. This external control permits electronic manipulation of the phase of terahertz waves with high precision, as high as 2−5° in the frequency range 0.26–0.27 THz, with an average phase error of only 0.36°, corresponding to a timing error of only 4 fs. Critically, the average insertion loss is as low as 6.14 dB at 0.265 THz, with a low amplitude fluctuation of 0.5 dB, so the device offers near-ideal phase-only modulation.
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This work was supported by the National Natural Science Foundation of China under contract no. 61931006 (Y.Z.), the National Key Research and Development Program of China under contract no. 2018YFB1801503 (Y.Z.), the Fundamental Research Funds for the Central Universities no. ZYGX2020ZB011 (Y.Z.), the China Postdoctoral Science Foundation no. 2020M683285 (H.Z.), the National Natural Science Foundation of China under contracts 61921002 (Y.G.) and U20A20212 (Z.Y.) and the US National Science Foundation grant no. 1923733 (D.M.M.).
The authors declare no competing interests.
Peer review information Nature Photonics thanks Juraj Darmo, Yanko Todorov and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Zeng, H., Liang, H., Zhang, Y. et al. High-precision digital terahertz phase manipulation within a multichannel field perturbation coding chip. Nat. Photon. 15, 751–757 (2021). https://doi.org/10.1038/s41566-021-00851-6
Nature Photonics (2021)