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  3. Review: Nanoscale terahertz scanning probe microscopy

Review: Nanoscale terahertz scanning probe microscopy

2021/08/31

Four international experts, including the leader of the Nanooptics group at nanoGUNE Rainer Hillenbrand, analyze in ‘Nature Photonics’ the terahertz scanning probe microscopy techniques that achieve spatial resolution on the scale of micrometres to ångströms, with particular emphasis on their overarching approaches and underlying probing mechanisms, and they forecast the next steps in the field.

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Zooming in on surfaces with terahertz microscopy

Terahertz radiation has become an important diagnostic tool in the development of new technologies. However, the diffraction limit prevents terahertz radiation (λ ≈ 0.01–3 mm) from being focused to the nanometer length scale of modern devices. In response to this challenge, terahertz scanning probe microscopy techniques based on coupling terahertz radiation to subwavelength probes such as sharp tips have been developed. These probes enhance and confine the light, improving the spatial resolution of terahertz experiments by up to six orders of magnitude.

For further information:

Reference:

T. L. Cocker, V. Jelic, R. Hillenbrand & F. A. Hegmann Nature Photonics. “Nanoscale terahertz scanning probe microscopy” DOI: 10.1038/s41566-021-00835-6

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