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Related Concept Videos

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
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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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Related Experiment Video

Updated: Jun 19, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
10:35

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Multiple Bragg diffraction in polymeric photonic crystals.

Rajesh V Nair1, R Vijaya

  • 1Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India.

Applied Optics
|November 3, 2009
PubMed
Summary
This summary is machine-generated.

Researchers studied angle-resolved photonic stop bands in 3D photonic crystals. A new reflection peak emerges at higher incidence angles due to light coupling, primarily from the (200) plane.

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Area of Science:

  • Condensed matter physics
  • Materials science
  • Optics

Background:

  • Photonic crystals offer control over light propagation.
  • Understanding their optical properties is crucial for device applications.
  • Angle-dependent behavior is key for advanced photonic functionalities.

Purpose of the Study:

  • To systematically investigate the angle-resolved photonic stop band.
  • To analyze the reflection spectrum of 3D ordered polymeric photonic crystals.
  • To identify the origins of spectral features at various incidence angles.

Main Methods:

  • Fabrication of 3D ordered polymeric photonic crystals via colloidal self-assembly.
  • Measurement of angle-resolved reflection spectra.
  • Analysis of photonic stop band shifts and peak emergence.

Main Results:

  • The first-order photonic stop band exhibits a single peak, shifting to shorter wavelengths with increasing incidence angle.
  • A new reflection peak appears beyond 45 degrees incidence.
  • This new peak is attributed to the coupling of incident light into other directions of the face-centered cubic (fcc) Brillouin zone.
  • Reflection from the (200) plane is identified as the predominant contribution.

Conclusions:

  • The study reveals complex angle-dependent photonic behavior in 3D crystals.
  • Light coupling into different Brillouin zone directions significantly influences the reflection spectrum.
  • Understanding these phenomena is vital for designing tunable photonic devices.