Terahertz waveforms can now be measured with atomic-scale spatial resolution as a result of a new form of terahertz time-domain spectroscopy that uses tunnelling electrons as an ultrafast, localized probe. The approach paves the way for ultrafast optical surface analysis at the scale of individual molecules or atoms.
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Baumann, S., Loth, S. Shrinking time-domain spectroscopy to atomic dimensions. Nat. Photon. 18, 886–887 (2024). https://doi.org/10.1038/s41566-024-01510-2
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DOI: https://doi.org/10.1038/s41566-024-01510-2
