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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Source transformation device formed by one-dimensional photonic crystal.

N Yogesh1, V Subramanian

  • 1Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India.

Optics Letters
|May 5, 2011
PubMed
Summary

This study demonstrates how one-dimensional photonic crystals can transform cylindrical waves into highly directional plane waves using gap solitary wave behavior. The bandgap strength determines the amplitude of the emitted plane waves.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Wave Phenomena

Background:

  • Photonic bandgap structures offer unique optical properties.
  • Metamaterials enable novel optical device functionalities.
  • Transformational optics seeks to control light propagation.

Purpose of the Study:

  • To demonstrate cylindrical to plane wave transformation using a one-dimensional photonic crystal.
  • To investigate the role of gap solitary waves in wave transformation.
  • To analyze the limitations of photonic crystal-based wave transformation devices.

Main Methods:

  • Utilizing an open cavity formed by a one-dimensional photonic crystal.
  • Operating in the near-bandgap regime to observe gap solitary wave behavior.
  • Analyzing the generation of plane waves from a point source.

Main Results:

  • Successful transformation of cylindrical waves into highly directional plane waves was achieved.
  • Gap solitary wave behavior was identified as the mechanism for transformation.
  • The strength of the photonic bandgap was found to govern the amplitude of the emitted plane waves.

Conclusions:

  • One-dimensional photonic crystals can function as transformational optical devices.
  • Gap solitary waves in photonic crystals enable efficient wave shaping.
  • The bandgap strength is a critical parameter for controlling the output of such devices.