Agile manipulation of the time-frequency distribution of high-speed electromagnetic waves

Xinyi Zhu, Benjamin Crockett, Connor M. L. Rowe, Hao Sun and José Azaña ()
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Xinyi Zhu: Suite 6900
Benjamin Crockett: Suite 6900
Connor M. L. Rowe: Suite 6900
Hao Sun: Suite 6900
José Azaña: Suite 6900

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Controlling the temporal evolution of an electromagnetic (EM) wave’s frequency components, the so-called time-frequency (TF) distribution, in a versatile and real-time fashion remains very challenging, especially at the high speeds (> GHz regime) required in contemporary communication, imaging, and sensing applications. We propose a general framework for manipulating the TF properties of high-speed EM waves. Specifically, the TF distribution is continuously mapped along the time domain through phase-only processing, enabling its user-defined manipulation via widely-available temporal modulation techniques. The time-mapping operations can then be inverted to reconstruct the TF-processed signal. Using off-the-shelf telecommunication components, we demonstrate arbitrary control of the TF distribution of EM waves over a full bandwidth approaching 100 GHz with nanosecond-scale programmability and MHz-level frequency resolution. We further demonstrate applications for mitigating rapidly changing frequency interference terms and the direct synthesis of fast waveforms with customized TF distributions. The reported method represents a significant advancement in TF processing of EM waves and it fulfills the stringent requirements for many modern and emerging applications.

Date: 2024
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DOI: 10.1038/s41467-024-53025-7

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