Pistore, Valentino;
Viti, Leonardo;
Schiattarella, Chiara;
Wang, Zhengtianye;
Law, Stephanie;
Mitrofanov, Oleg;
Vitiello, Miriam S;
(2023)
Holographic Nano-Imaging of Terahertz Dirac Plasmon Polaritons Topological Insulator Antenna Resonators.
Small
, Article e2308116. 10.1002/smll.202308116.
(In press).
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Abstract
Excitation of Dirac plasmon polaritons (DPPs) in bi-dimensional materials have attracted considerable interest in recent years, both from perspectives of understanding their physics and exploring their transformative potential for nanophotonic devices, including ultra-sensitive plasmonic sensors, ultrafast saturable absorbers, modulators, and switches. Topological insulators (TIs) represent an ideal technological platform in this respect because they can support plasmon polaritons formed by Dirac carriers in the topological surface states. Tracing propagation of DPPs is a very challenging task, particularly at terahertz (THz) frequencies, where the DPP wavelength becomes over one order of magnitude shorter than the free space photon wavelength. Furthermore, severe attenuation hinders the comprehensive analysis of their characteristics. Here, the properties of DPPs in real TI-based devices are revealed. Bi2 Se3 rectangular antennas can efficiently confine the propagation of DPPs to a single dimension and, as a result, enhance the DPPs visibility despite the strong intrinsic attenuation. The plasmon dispersion and loss properties from plasmon profiles are experimentally determined, along the antennas, obtained using holographic near-field nano-imaging in a wide range of THz frequencies, from 2.05 to 4.3 THz. The detailed investigation of the unveiled DPP properties can guide the design of novel topological quantum devices exploiting their directional propagation.
| Type: | Article |
|---|---|
| Title: | Holographic Nano-Imaging of Terahertz Dirac Plasmon Polaritons Topological Insulator Antenna Resonators |
| Location: | Germany |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/smll.202308116 |
| Publisher version: | http://dx.doi.org/10.1002/smll.202308116 |
| Language: | English |
| Additional information: | © 2023 The Authors. Small published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
| Keywords: | MBE, large area topological insulators, near field, plasmon polaritons |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/10184907 |
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