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Transverse spin angular momentum of a space-time surface plasmon polariton wave packet

Naoki Ichiji1,2, Daigo Oue3,4,5, Murat Yessenov6, Kenneth L. Schepler6, Ayman F. Abouraddy6, and Atsushi Kubo7,*

  • 1Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki 305-8571, Japan
  • 2Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8505, Japan
  • 3Instituto de Telecomunicações, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
  • 4Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 5The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
  • 6CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, Florida 32816, USA
  • 7Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki 305-8571, Japan

  • *kubo.atsushi.ka@u.tsukuba.ac.jp

Phys. Rev. A 107, 063517 – Published 28 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063517

Abstract

In addition to longitudinal spin angular momentum (SAM) along the axis of propagation of light, spatially structured electromagnetic fields such as evanescent waves and focused beams have recently been found to possess transverse SAM in the direction perpendicular to the axis of propagation. In particular, the SAM of surface plasmon polaritons (SPPs) with spatial structure has been extensively studied in the last decade after it became clear that evanescent fields with spatially structured energy flow generate three-dimensional spin texture. Here we present numerical calculations of the space-time surface plasmon polariton (ST-SPP) wave packet, a plasmonic bullet that propagates at an arbitrary group velocity while maintaining its spatial distribution. ST-SPP wave packets with complex spatial structure and energy flow density distribution determined by the group velocity are found to propagate with accompanying three-dimensional spin texture and finite topological charge density. Furthermore, the spatial distribution of the spin texture and topological charge density determined by the spatial structure of the SPP is controllable, and the deformation associated with propagation is negligible. ST-SPP wave packets, which can stably transport customizable three-dimensional spin textures and topological charge densities, can be excellent subjects of observation in studies of spin photonics and optical topological materials.

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