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Related Concept Videos

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.
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...

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Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Invisibility and cloaking based on scattering cancellation.

Pai-Yen Chen1, Jason Soric, Andrea Alù

  • 1The University of Texas at Austin, Department of Electrical and Computer Engineering, 1 University Station C0803, Austin, TX 78712-0240, USA.

Advanced Materials (Deerfield Beach, Fla.)
|October 20, 2012
PubMed
Summary

Metamaterials and advanced materials enable new possibilities for invisibility and cloaking devices. This review highlights scattering-cancellation techniques using plasmonic and mantle cloaking for various applications.

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Last Updated: May 17, 2026

Scattering And Absorption of Light in Planetary Regoliths
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Published on: July 1, 2019

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

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Published on: February 8, 2014

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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters

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Area of Science:

  • Electromagnetic theory
  • Materials science
  • Nanotechnology

Background:

  • Metamaterials and advanced materials offer novel ways to manipulate electromagnetic properties.
  • Invisibility and cloaking represent significant potential applications of these materials.
  • Conventional electromagnetic limits can be surpassed with tailored material properties.

Purpose of the Study:

  • To review recent advancements in invisibility and cloaking technologies.
  • To highlight solutions utilizing metamaterials, metasurfaces, graphene, and plasmonic materials.
  • To focus on scattering-cancellation approaches for cloaking.

Main Methods:

  • Review of recently proposed solutions for invisibility and cloaking.
  • Analysis of plasmonic and mantle cloaking techniques.
  • Discussion of material challenges and opportunities.

Main Results:

  • Scattering-cancellation approaches are central to plasmonic and mantle cloaking.
  • These techniques are applicable across different spectral ranges and devices.
  • Material aspects are crucial for the realization of cloaking phenomena.

Conclusions:

  • Metamaterials and advanced materials provide promising avenues for cloaking.
  • Further research into material science is needed for practical realization.
  • Scattering-cancellation techniques offer viable pathways towards invisibility.