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Quasiperiodic moiré plasmonic crystals.

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Quasiperiodic moiré structures in silver plasmonic crystals show more light-manipulating modes and band gaps than periodic ones. A new indexing system helps predict these optical properties for broadband light applications.

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Area of Science:

  • Photonics and Plasmonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Periodic plasmonic crystals are widely studied for light manipulation.
  • Quasiperiodic structures offer unique optical properties due to their symmetries.
  • Understanding surface plasmon polariton (SPP) modes is crucial for photonic devices.

Purpose of the Study:

  • To investigate the optical properties of silver plasmonic crystals with quasiperiodic rotational symmetries.
  • To compare the behavior of quasiperiodic moiré structures with traditional periodic plasmonic crystals.
  • To develop a method for predicting plasmonic band gaps in quasiperiodic systems.

Main Methods:

  • Fabrication and characterization of silver plasmonic crystals with quasiperiodic moiré structures.
  • Experimental measurement of surface plasmon polariton (SPP) modes at various excitation angles.
  • Development of a Bragg-based indexing system utilizing reciprocal lattice vectors.

Main Results:

  • Quasiperiodic moiré structures exhibit a higher number of SPP modes compared to periodic crystals, particularly at high excitation angles.
  • Plasmonic band gaps frequently form at the intersections of these novel SPP modes.
  • The developed indexing system accurately predicts the origin and location of band gaps in moiré plasmonic crystals.
  • The indexing model is applicable to more complex quasiperiodic geometries.

Conclusions:

  • Quasiperiodic plasmonic crystals offer enhanced control over light propagation through increased SPP modes and band gap formation.
  • The Bragg-based indexing system provides a powerful tool for designing and understanding quasiperiodic photonic structures.
  • These quasiperiodic lattices hold promise for advanced applications in broadband light concentration and manipulation.