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Spectroscopy

Nanoscale terahertz spectroscopy

The advent of terahertz spectroscopy schemes that offer single-photon sensitivity, femtosecond time resolution and nanometre spatial resolution is creating new opportunities for investigating ultrafast charge dynamics in semiconductor structures.

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Figure 1: State-of-the-art implementation of transient terahertz (THz) time-domain spectroscopy with a single-photon-level signal-to-noise ratio, which allows the THz response from a nanoscale object — an InAs nanowire (blue) on a diamond substrate (green) — to be measured.

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Correspondence to Hidemi Shigekawa.

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Shigekawa, H., Yoshida, S. & Takeuchi, O. Nanoscale terahertz spectroscopy. Nature Photon 8, 815–817 (2014). https://doi.org/10.1038/nphoton.2014.272

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