Berlin 2024 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 5: Theoretical Aspects of Condensed Matter I

MP 5.2: Vortrag

Montag, 18. März 2024, 16:20–16:40, HL 102

Unidirectional Wave Propagation in a Topological Plasmonic Ring Resonator via a Symmetry-Broken Excitation Scheme — •Fatemeh Davoodi and Nahid Talebi — Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany

Topological plasmonics, at the intersection of topology and plasmonics, offers an innovative approach to light manipulation, leveraging the Su-Schrieffer-Heeger model to create resilient ring-shaped plasmonic chains with topologically protected edge modes. This study thoroughly investigates the design, characterization, and manipulation of these topological plasmonic chains comprised of nano-discs. Emphasis is placed on understanding the unique properties of resonators, particularly their potential to support topologically protected edge modes within rotationally symmetric optical modes in a ring geometry. Utilizing a symmetry-breaking excitation technique with electron beams, topological edge modes are observed in rotationally symmetric chains. We analyze the influence of parameters like dimerization and loop numbers on the presence of the Edge modes. Additionally, the electron impact is suggested as a parameter to control the direction of propagation and selectively excite specific bulk or edge modes. These findings hold important implications for the advancement of nanoscale plasmonic systems with tailored functionalities, and unidirectional propagation of light in topological ring resonators coupled to point-like emitters such as quantum dots and defect centers.

Keywords: plasmonics; topological plasmonic; nanoparticle chain; symmetry-breaking excitation; edge states