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Related Concept Videos

X-ray Crystallography02:18

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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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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 25, 2026

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

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Published on: September 26, 2014

Multiband negative refraction in one-dimensional photonic crystals.

J E Lugo1, B de la Mora, R Doti

  • 1Visual Psychophysics and Perception Laboratory, School of Optometry, University of Montreal, C.P. 6128 succ.Centre Ville, Montreal, Quebec, Canada H3C3J7.

Optics Express
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

We simulated and demonstrated negative refraction in one-dimensional photonic crystals (1DPC). This breakthrough in photonic crystals opens doors for creating efficient Veselago lenses for various optical applications.

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Last Updated: Jun 25, 2026

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Area of Science:

  • Photonics
  • Materials Science
  • Optics

Background:

  • One-dimensional photonic crystals (1DPCs) are artificial structures with unique electromagnetic properties.
  • Negative refraction, a phenomenon where light bends in the opposite direction than usual, is crucial for advanced optical devices.
  • Porous silicon 1DPCs offer potential for novel optical functionalities due to their tunable properties.

Purpose of the Study:

  • To investigate the possibility of negative refraction in lossless one-dimensional photonic crystal structures.
  • To experimentally validate negative refraction in a specific 1DPC material.
  • To explore the potential applications of this 1DPC structure in optical devices.

Main Methods:

  • Numerical simulations of a lossless one-dimensional photonic crystal structure.
  • Experimental fabrication and characterization of strongly modulated porous silicon 1DPCs.
  • Optical measurements in the visible and near-infrared regions to observe refractive properties.

Main Results:

  • Simulations predicted negative refraction near the bandgaps of the 1DPC.
  • Experimental demonstration of negative refraction in porous silicon 1DPCs.
  • Observation of negative refraction in both visible and near-infrared spectra.

Conclusions:

  • The fabricated porous silicon 1DPC exhibits negative refraction.
  • This 1DPC structure is a promising platform for realizing short-focus Veselago lenses.
  • The simple fabrication process allows for cost-effective and rapid production of these photonic crystal devices.