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Magneto-optical effects in interacting localized and propagating surface plasmon modes.

Jorge F Torrado1, Juan B González-Díaz, María U González

  • 1IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, E-28760 Tres Cantos, Madrid, Spain.

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External magnetic fields alter surface plasmon propagation by coupling localized (LSP) and propagating (SPP) surface plasmons. This coupling makes both LSP and SPP modes sensitive to magnetic field effects.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Surface plasmons, collective oscillations of electrons at a material's surface, are crucial for light-matter interactions.
  • Localized surface plasmons (LSP) and propagating surface plasmons (SPP) are distinct plasmonic modes with unique properties.
  • External magnetic fields can influence electronic behavior, potentially affecting plasmon propagation.

Purpose of the Study:

  • To investigate the influence of external magnetic fields on surface plasmon propagation.
  • To explore the role of coupling between localized (LSP) and propagating (SPP) surface plasmons in modifying magnetic field effects.
  • To understand how magnetic fields affect plasmon dispersion and sensitivity.

Main Methods:

  • Theoretical modeling of coupled LSP and SPP modes.
  • Analysis of plasmon dispersion relations under external magnetic fields.
  • Simulation of wavevector modification and mode sensitivity.

Main Results:

  • In the absence of coupling, magnetic fields primarily modify the SPP wavevector, with minimal effect on LSPs.
  • Coupling between LSP and SPP modes leads to significant alterations in the magnetic field's influence on the SPP dispersion curve.
  • The coupled system demonstrates that LSPs become sensitive to the external magnetic field once interaction occurs.

Conclusions:

  • Coupling between LSP and SPP modes is an effective mechanism for tuning the response of surface plasmons to external magnetic fields.
  • This interaction-induced sensitivity opens new avenues for magnetic field control in plasmonic devices.
  • Understanding these coupled plasmon dynamics is essential for designing advanced plasmonic sensors and optical components.