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Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Symmetry in Maxwell's Equations01:28

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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Related Experiment Video

Updated: Jul 4, 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

Demixing light paths inside disordered metamaterials.

I M Vellekoop1, E G van Putten, A Lagendijk

  • 1Complex Photonic Systems, Faculty of Science and Technology and MESA+ Institute forNanotechnology, University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands. i.m.vellekoop@utwente.nl

Optics Express
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

We focused light inside disordered metamaterials by controlling light scattering. This breakthrough uses multi-path interference to concentrate light, overcoming scattering limitations for targeted applications.

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Area of Science:

  • Photonics and Metamaterials
  • Wave Optics and Interference

Background:

  • Disordered photonic metamaterials exhibit strong light scattering, preventing traditional focusing.
  • Conventional geometric optics fail to achieve light localization in such complex media.

Purpose of the Study:

  • To demonstrate the first experimental method for focusing light within disordered photonic metamaterials.
  • To overcome the inherent scattering limitations in these materials for precise light delivery.

Main Methods:

  • Utilized multi-path interference of incident light waves.
  • Leveraged the deterministic nature of light scattering in time-fixed disordered materials.
  • Employed measurements of nanoscale fluorescent probe's emission to guide wave combination.

Main Results:

  • Successfully concentrated light at a specific target position within the disordered metamaterial.
  • Constructed a specific linear combination of hundreds of incident waves for constructive interference.
  • Demonstrated light focusing by actively controlling the scattering process.

Conclusions:

  • The developed method enables light focusing in scattering media, opening new possibilities in photonics.
  • This technique overcomes the limitations of geometric optics in complex materials.
  • The deterministic nature of scattering in disordered media is key to achieving controlled light localization.