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Multichannel optical diode with unidirectional diffraction relevant total transmission.

Andriy E Serebryannikov1, A Ozgur Cakmak, Ekmel Ozbay

  • 1Hamburg University of Technology, E-3, D-21071 Hamburg, Germany. serebryannikov@tu-harburg.de

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Summary

Nonsymmetric photonic crystal gratings enable broadband unidirectional optical transmission, achieving a diode-like effect. This phenomenon, driven by diffraction and dispersion, allows light to pass in one direction but not the other.

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Area of Science:

  • Photonics
  • Optical physics
  • Materials science

Background:

  • Photonic crystal gratings offer unique light manipulation properties.
  • Unidirectional optical transmission is crucial for optical diodes and switches.
  • Previous studies have explored unidirectional transmission with limitations.

Purpose of the Study:

  • To demonstrate broadband unidirectional optical transmission in nonsymmetric photonic crystal gratings.
  • To investigate the physical mechanism behind this diode-like optical behavior.
  • To explore applications in beam deflection and splitting.

Main Methods:

  • Utilizing nonsymmetric photonic crystal gratings made of isotropic linear materials.
  • Analyzing the merging of diffraction and dispersion effects.
  • Investigating higher-order diffraction channels and broken spatial inversion symmetry.

Main Results:

  • Achieved broadband unidirectional optical transmission with total transmission maximum within the band.
  • Demonstrated a diode-like operation regime with total transmission in one direction and zero in the opposite.
  • Observed single-beam deflection and two-beam splitting with nearly total transmission when the corrugated side is illuminated.
  • Showcased unidirectional transmission at a fixed frequency due to diffractions when the noncorrugated side is illuminated.

Conclusions:

  • Nonsymmetric photonic crystal gratings can effectively create broadband unidirectional optical transmission.
  • The mechanism relies on the interplay between diffraction, dispersion, and broken spatial symmetry.
  • This provides a pathway for developing advanced optical devices like optical diodes.