Anglhuber, Simon and Zizlsperger, Martin and Pogna, Eva A. A. and Gerasimenko, Yaroslav A. and Koulouklidis, Anastasios D. and Gronwald, Imke and Nerreter, Svenja and Viti, Leonardo and Vitiello, Miriam S. and Huber, Rupert and Huber, Markus A. (2025) Spacetime Imaging of Group and Phase Velocities of Terahertz Surface Plasmon Polaritons in Graphene. NANO LETTERS, 25 (6). pp. 2125-2132. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Detecting electromagnetic radiation scattered from a tip-sample junction has enabled overcoming the diffraction limit and started the flourishing field of polariton nanoimaging. However, most techniques only resolve amplitude and relative phase of the scattered radiation. Here, we utilize field-resolved detection of ultrashort scattered pulses to map the dynamics of surface polaritons in both space and time. Plasmon polaritons in graphene serve as an ideal model system for the study, demonstrating how propagating modes can be visualized and modeled in the time domain by a straightforward mathematical equation and normalization method. This novel approach enables a direct assessment of the polaritons' group and phase velocities, as well as the damping. Additionally, it is particularly powerful in combination with a pump-probe scheme to trace subcycle changes in the polariton propagation upon photoexcitation. Our method readily applies to other quantum materials, providing a versatile tool to study ultrafast nonequilibrium spatiotemporal dynamics of polaritons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ULTRAFAST; NANOSCOPY; terahertz surface plasmon polaritons; near-field opticalmicroscopy; s-SNOM; field-resolved; graphene; time-resolved; hypertemporal map; phase velocity; group velocity; all-optical control |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Regensburg Center for UltrafastNanoscopy (RUN) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jun 2026 09:37 |
| Last Modified: | 16 Jun 2026 09:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66180 |
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