Propagation-Invariant Space–Time Plasmonic Pulse in Subwavelength MIM Waveguide

Eui Soo Cho, Seung Yeol Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The metal-insulator-metal (MIM) plasmonic waveguide has been highly anticipated for confining and guiding surface plasmon polaritons (SPPs) on the subwavelength scale. However, perennial drawbacks such as a short propagation length and an unbounded transverse field have set limits on the use of the MIM waveguide in various applications. Herein, diffraction- and dispersion-free MIM modes are synthesized by using space–time wave packets (STWPs) and are therefore referred to as space–time MIM (ST-MIM) waveguide modes. Compared to a Gaussian pulse of the same duration and spectral bandwidth, the ST-MIM demonstrates enhanced propagation lengths of about 2.4 times for the symmetric mode and about 6.3 times for the antisymmetric mode. In the simulations, the ST-MIMs are confined in all transverse dimensions, thereby overriding the diffraction limits. In addition, the group velocities of the ST-MIMs can be arbitrarily designed, which makes it possible to synchronize the pulse propagation speeds of the symmetric and antisymmetric MIM modes.

Original languageEnglish
Article number425
JournalNanomaterials
Volume14
Issue number5
DOIs
StatePublished - Mar 2024

Keywords

  • diffraction-free beams
  • metal-insulator-metal plasmonic waveguide
  • propagation-invariant wave packets
  • space–time wave packets
  • surface plasmon polaritons

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