Affiliation:
1. School of Mathematics and Physics North China Electric Power University Beijing 102206 China
2. Hebei Key Laboratory of Physics and Energy Technology North China Electric Power University Baoding 071000 China
3. Department of Physics Southern University of Science and Technology Shenzhen 518055 China
4. Quantum Science Center of Guangdong‐Hong Kong‐Macao Greater Bay Area (Guangdong) Shenzhen 518045 China
Abstract
AbstractToroidal vortices, or vortex rings, are torus‐shaped vortices observed in various fluid systems. Recently, optical toroidal vortices, novel solutions to Maxwell's equations, have been experimentally observed (Nat. Photonics, 2022, 16, 519). Thus, their nanoplasmonic counterparts, namely plasmonic toroidal vortices, are highly anticipated. This study aims to elucidate the generation and manifestation of plasmonic toroidal vortices. To achieve this, a technique involving the illumination of a gold nanotorus with a radially‐polarized beam is employed. Notably, the plasmonic toroidal vortices exhibit a distinct photon flow trajectory along the minor radius of a nanotorus. This work presents an advancement in toroidal vortices within the plasmonic regime.
Funder
National Natural Science Foundation of China
Ministry of Science and Technology of the People's Republic of China
Fundamental Research Funds for the Central Universities