Viti, Leonardo and Schiattarella, Chiara and Sichert, Lucia and Wang, Zhengtianye and Law, Stephanie and Mitrofanov, Oleg and Vitiello, Miriam S. (2025) Tracing terahertz plasmon polaritons with a tunable-by-design dispersion in topological insulator metaelements. LIGHT-SCIENCE & APPLICATIONS, 14 (1): 288. ISSN 2095-5545, 2047-7538
Full text not available from this repository. (Request a copy)Abstract
Collective oscillations of massless charge carriers in two-dimensional materials-Dirac plasmon polaritons (DPPs)-are of paramount importance for engineering nanophotonic devices with tunable optical response. However, tailoring the optical properties of DPPs in a nanomaterial is a very challenging task, particularly at terahertz (THz) frequencies, where the DPP momentum is more than one order of magnitude larger than that of the free-space photons, and DDP attenuation is high. Here, we conceive and demonstrate a strategy to tune the DPP dispersion in topological insulator metamaterials. We engineer laterally coupled linear metaelements, fabricated from epitaxial Bi2Se3, with selected coupling distances with the purpose to tune their wavevector, by geometry. We launch and directly map the propagation of DPPs confined within coupled meta-atoms via phase-sensitive scattering-type scanning near-field nanoscopy. We demonstrate that the DPP wavelength can be tuned by varying the metaelements coupling distance, resulting in up to a 20% increase of the polariton wavevector Re(k(p)) in dimers and triplets with a 1 mu m spacing, with reduced losses and a >50% increase of the polariton attenuation length.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAPHENE; MICROSCOPY; SCATTERING; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Jun 2026 12:04 |
| Last Modified: | 03 Jun 2026 12:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67367 |
Actions (login required)
 |
View Item |
