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Related Concept Videos

Propagation of Waves01:07

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Coherent Wave Control in Complex Media with Arbitrary Wavefronts.

Philipp Del Hougne1, K Brahima Yeo1, Philippe Besnier1

  • 1Univ Rennes, CNRS, IETR - UMR 6164, F-35000, Rennes, France.

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|May 28, 2021
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Summary
This summary is machine-generated.

This study introduces programmable meta-atoms to control wave propagation in disordered materials, overcoming challenges in wavefront shaping (WFS) for diverse applications.

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Area of Science:

  • Physics
  • Metamaterials
  • Wave Phenomena Control

Background:

  • Wavefront shaping (WFS) is crucial for controlling wave propagation in disordered media.
  • Existing WFS methods require precise control of input channels, posing practical challenges.
  • Applications include imaging, communication, energy transfer, and micromanipulation.

Purpose of the Study:

  • To overcome the limitations of traditional wavefront shaping.
  • To enable adaptive control of wave propagation in disordered media using programmable meta-atoms.
  • To unlock new functionalities with arbitrary incident wavefronts.

Main Methods:

  • Doping disordered media with programmable meta-atoms.
  • Experimental demonstration using electromagnetic waves in a chaotic cavity.
  • Utilizing programmable metasurfaces for adaptive wave control.

Main Results:

  • Successfully adapted disordered media to arbitrary incoming wavefronts.
  • Eliminated the need for pre-shaped incident wavefronts.
  • Demonstrated applications in focusing and coherent perfect absorption.

Conclusions:

  • Programmable meta-atoms offer a novel approach to coherent wave control.
  • This method simplifies wavefront shaping protocols.
  • Facilitates the transition of WFS technologies into practical applications across various wave phenomena.