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Crescent shaped dielectric periodic structure for light manipulation.

H Kurt1, M Turduev, I H Giden

  • 1Department of Electrical and Electronics Engineering TOBB University of Economics and Technology, Ankara, 06560 Turkey. hkurt@etu.edu.tr

Optics Express
|March 29, 2012
PubMed
Summary

Crescent-shaped photonic crystals offer tunable light manipulation by altering their opening angle. These all-dielectric structures enable self-collimated wave guiding without absorption losses.

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Area of Science:

  • Photonics
  • Materials Science
  • Optics

Background:

  • Periodic dielectric structures, or photonic crystals (PCs), are crucial for controlling light propagation.
  • Conventional PCs often rely on symmetry for light manipulation, limiting design flexibility.
  • Breaking circular symmetry in unit cells offers new avenues for optical control.

Purpose of the Study:

  • To investigate the optical properties of novel crescent-shaped photonic crystals (CPCs).
  • To explore the potential of CPCs for tunable light manipulation and self-collimated wave guiding.
  • To leverage the all-dielectric nature for loss-free optical applications.

Main Methods:

  • Fabrication of a square lattice periodic structure using crescent-shaped dielectric nano-rods.
  • Analysis of the optical properties, focusing on dispersion and iso-frequency contours.
  • Investigation of light propagation characteristics, including self-collimation and beam steering.

Main Results:

  • The designed CPCs exhibit anisotropic iso-frequency contours, leading to tilted self-collimated wave guiding.
  • Light propagation direction can be precisely tuned by adjusting the crescent's opening angle.
  • The all-dielectric composition ensures the absence of optical absorption losses.

Conclusions:

  • CPCs provide a versatile platform for advanced light manipulation, including focusing, routing, splitting, and deflection.
  • The rotational sensitivity and tunable propagation direction offer significant advantages over traditional PCs.
  • These findings pave the way for efficient, low-loss optical devices.