Dirac plasmon polaritons and magnetic modes in topological-insulator nanoparticles

Nikolaos Kyvelos; Vassilios Yannopapas; N. Asger Mortensen; Christos Tserkezis

doi:10.1117/12.3016959

18 June 2024 Dirac plasmon polaritons and magnetic modes in topological-insulator nanoparticles

Nikolaos Kyvelos, Vassilios Yannopapas, N. Asger Mortensen, Christos Tserkezis

Proceedings Volume PC12994, Terahertz Photonics III; PC1299403 (2024) https://doi.org/10.1117/12.3016959
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Bismuth chalcogenides have emerged as an intriguing option in nanophotonics due to their unique properties, including a significant dielectric function and topologically protected surface states in the terahertz (THz) range. Our study focuses on the optical response of Bi2Se3 topological-insulator nanospheres, where topological properties arise, influencing electromagnetic modes and field enhancement. Within a fully electrodynamic picture, we explore the emergence of unreported magnetic modes induced by Dirac plasmon polaritons resulting from terahertz photon and Dirac electron interactions. We observe their profound impact on electric and magnetic transitions of quantum emitters near Bi2Se3 nanospheres, resulting in record - high Purcell factors. Our research highlights the rich optical response of Bi2Se3 nanospheres, involving contributions from both phonon polaritons and topologically protected surface states. Our findings confirm the emergence of topological optical modes in Bi2Se3 spherical TIs, positioning them as promising candidates for advancements in strong light-matter interactions in topological nanophotonics and THz technologies.

Conference Presentation

Citation Download Citation

Nikolaos Kyvelos, Vassilios Yannopapas, N. Asger Mortensen, and Christos Tserkezis "Dirac plasmon polaritons and magnetic modes in topological-insulator nanoparticles", Proc. SPIE PC12994, Terahertz Photonics III, PC1299403 (18 June 2024); https://doi.org/10.1117/12.3016959

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