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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Quantum Mechanics

Background:

  • Charge transfer plasmons (CTPs) arise from reducing gaps between subwavelength metallic objects to atomic scales or by conductive bridging.
  • CTPs exhibit unique spectral features distinct from conventional plasmon modes.

Purpose of the Study:

  • To review the fundamental principles, properties, and emerging applications of charge transfer plasmons.
  • To explore excitation mechanisms and practical implementations for advanced nanophotonic devices.

Main Methods:

  • Analysis based on classical electrodynamics and quantum mechanics.
  • Review of experimental approaches for CTP excitation and control.
  • Investigation of hybrid nanophotonic device integration.

Main Results:

  • Quantum tunneling-induced CTPs can be switched by light intensity.
  • Conductively bridged CTPs lack tunability.
  • Integration with optothermal and optoelectronic components enables tunable CTPs.

Conclusions:

  • CTPs are crucial for developing high-response, efficient subwavelength nanophotonic devices.
  • Tunable plasmonic devices like metamodulators and metafilters are achievable.
  • Hybrid nanostructures offer multifunctional CTP-resonant tools.