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X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Updated: Jun 27, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Published on: October 11, 2016

Efficient Bragg diffraction in thin semiconductor two-dimensional gratings.

Q He1, I Zaquine, R André

  • 1Laboratoire Traitement et Communication de l'Information, CNRS et Institut Télécom, Télécom-ParisTech, dép. TSI, 46 rue Barrault, 75634 Paris Cedex 13, France.

Optics Letters
|November 28, 2008
PubMed
Summary
This summary is machine-generated.

This study demonstrates a two-dimensional grating in a semiconductor photonic crystal with highly improved diffraction properties. The device shows near unity efficiency and wavelength selectivity, making it promising for optical signal processing applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Semiconductor Physics

Background:

  • One-dimensional photonic crystals (1D-PCs) offer unique optical properties.
  • Diffraction gratings are crucial components in various optical systems.
  • Integrating gratings with photonic crystals can enhance their performance.

Purpose of the Study:

  • To demonstrate highly improved diffraction properties using a novel 2D grating structure.
  • To investigate the diffraction efficiency and wavelength selectivity of the proposed device.
  • To explore the potential of this device for optical signal processing.

Main Methods:

  • Optically recording a transmission grating onto a semiconductor 1D-PC.
  • Utilizing Bragg incidence for the read beam.
  • Operating at a wavelength corresponding to the 1D-PC band edge.
  • Integrating the 2D grating with a Bragg mirror.

Main Results:

  • Achieved near unity internal diffraction efficiency.
  • Demonstrated high wavelength selectivity.
  • Observed Bragg diffraction regime operation.
  • Obtained a single diffracted beam when the 2D grating was grown on a Bragg mirror.

Conclusions:

  • The developed 2D grating in a 1D-PC exhibits superior diffraction characteristics.
  • The device's performance is optimized at Bragg incidence and the band edge wavelength.
  • The single diffracted beam output on a Bragg mirror highlights its potential for optical signal processing.