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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.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

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Related Experiment Video

Updated: Jun 16, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Chiral diffraction gratings in twisted microstructured fibers.

Victor M Churikov1, Victor I Kopp, Azriel Z Genack

  • 1Chiral Photonics, Inc., Pine Brook, New Jersey 07058, USA. vchurikov@chiralphotonics.com

Optics Letters
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Uniformly twisted silica microstructured fibers exhibit spectral dips due to helical Bragg diffraction. This chiral diffraction grating is suitable for high-temperature sensing up to 1000°C.

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Last Updated: Jun 16, 2026

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Sensing

Background:

  • Microstructured optical fibers offer unique light-guiding properties.
  • Chirality in optical materials can lead to novel diffraction phenomena.
  • High-temperature sensing is crucial for various industrial applications.

Purpose of the Study:

  • To investigate spectral features in uniformly twisted pure-silica microstructured fibers.
  • To determine the origin of observed spectral dips.
  • To evaluate the potential of these fibers for high-temperature sensing applications.

Main Methods:

  • Fabrication of uniformly twisted pure-silica microstructured fibers.
  • Measurement of transmission spectra.
  • Analysis of spectral dip positions and their dependence on temperature and surrounding medium.

Main Results:

  • Observed dips in transmission spectra.
  • Spectral positions of dips are consistent with Bragg diffraction from the helical structure.
  • Dips are insensitive to the surrounding medium.
  • Reproducible variation of dip wavelength with temperature up to 1000°C.

Conclusions:

  • The observed spectral dips originate from Bragg diffraction by the fiber's helical structure.
  • The chiral diffraction grating in these fibers demonstrates high-temperature sensing capabilities.
  • These findings highlight the potential for developing robust high-temperature optical sensors.