Pistore, Valentino;
Schiattarella, Chiara;
Viti, Leonardo;
Siday, Thomas;
Johnston, Michael B;
Mitrofanov, Oleg;
Vitiello, Miriam S;
(2024)
Near-field probes for sensitive detectorless near-field nanoscopy in the 2.0-4.6 THz range.
Applied Physcis Letters
, 124
(22)
, Article 221105. 10.1063/5.0179714.
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Abstract
Imaging and spectroscopy at terahertz (THz) frequencies have become key methods for fundamental studies across the physical sciences. With the emergence of nanoscale materials and devices, holding great promise for photonics, electronics, and communication technologies, the search for THz analysis at the nanoscale arises. Detectorless THz near-field nanoscopy emerged as a versatile method for hyperspectral mapping of light-matter interaction phenomena in bi-dimensional materials and systems. However, it is strongly limited by the weak scattering efficiencies of atomic force microscope (AFM) tips. Here, we experimentally evaluate the performance of unconventional AFM tip shapes to enhance the scattering efficiency, at three frequencies, namely, 2.0, 3.0, and 4.6 THz. The impact of tip geometry is corroborated by numerical simulations. The shorter shank length of the evaluated tips provides a very compelling alternative to commercial tips at frequencies >2 THz.
| Type: | Article |
|---|---|
| Title: | Near-field probes for sensitive detectorless near-field nanoscopy in the 2.0-4.6 THz range |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0179714 |
| Publisher version: | https://doi.org/10.1063/5.0179714 |
| Language: | English |
| Additional information: | VC 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10207281 |
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