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A periodic structure mimics a metamaterial.

Carsten Rockstuhl1, Ulf Peschel, Falk Lederer

  • 1Institute for Solid State Theory and Condensed Matter Optics, Friedrich Schiller University Jena, Max-Wien Platz 1, 07743 Jena, Germany. carsten.rockstuhl@uni.jena.de

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 4, 2007
PubMed
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Researchers demonstrate that periodic media can mimic metamaterial properties by exciting higher-order Bloch modes. This finding offers new pathways for designing advanced optical materials with tunable resonant responses.

Area of Science:

  • Physics
  • Materials Science
  • Electromagnetism

Background:

  • Metamaterials offer unique electromagnetic properties through engineered unit cells.
  • Resonances in periodic structures are typically linked to their spatial periodicity.

Purpose of the Study:

  • To investigate if resonances evoked solely by the period of a medium can replicate metamaterial characteristics.
  • To explore the retrieval of effective material parameters in such periodic structures.

Main Methods:

  • Utilizing subwavelength periodic structures.
  • Retrieving effective material parameters from complex reflected and transmitted amplitudes.
  • Analyzing the spectral vicinity of resonances for Lorentzian line shapes.
  • Stacking the material to form a 3D medium and observing transmission stop gaps.

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Main Results:

  • Properties attributed to planar metamaterials were identified in a medium resonant due to its period alone.
  • Effective material parameters exhibited Lorentzian line shapes near resonances.
  • A stop gap in transmission was observed in the 3D stacked medium when the real part of a material parameter became negative.
  • The observed resonance was linked to higher-order Bloch mode excitation.

Conclusions:

  • The analyzed structure mimics metamaterial response but is not a true metamaterial due to higher-order Bloch mode excitation.
  • Periodic media can exhibit metamaterial-like properties without engineered unit cells, relying solely on periodicity.
  • This research opens possibilities for novel optical material design based on resonant periodic structures.