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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Standing Waves01:17

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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Sound Waves01:01

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
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Sound Waves: Interference00:53

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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...
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Shock Waves01:16

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Travelling Waves01:04

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Watching surface waves in phononic crystals.

Oliver B Wright1, Osamu Matsuda2

  • 1Division of Applied Physics, Faculty of Engineering, Hokkaido University, 060-8628 Sapporo, Japan olly@eng.hokudai.ac.jp.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 29, 2015
PubMed
Summary
This summary is machine-generated.

Ultrafast imaging reveals gigahertz acoustic waves in phononic crystals. This method maps acoustic modes, dispersion relations, and phonon stop bands using Fourier analysis of wave propagation movies.

Keywords:
acousticcrystalgigahertzimagingphononicultrasonic

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Area of Science:

  • Materials Science
  • Acoustics
  • Nanotechnology

Background:

  • Surface acoustic waves (SAWs) are crucial for phononic crystal applications.
  • Understanding SAW behavior in periodic structures requires advanced imaging techniques.

Purpose of the Study:

  • To review and demonstrate ultrafast imaging for analyzing gigahertz SAWs in phononic crystals.
  • To extract key acoustic properties and band structures from dynamic imaging data.

Main Methods:

  • Ultrafast imaging with quasi-point-source optical excitation.
  • Generating time-resolved image sequences (movies) of travelling acoustic waves.
  • Applying temporal and spatio-temporal Fourier analysis to imaging data.

Main Results:

  • Successfully obtained dispersion relations and mode patterns of acoustic modes.
  • Determined the position and widths of phonon stop bands.
  • Demonstrated tracking of phononic eigenstates in k-space using waveguide examples.

Conclusions:

  • Ultrafast imaging is a powerful tool for characterizing phononic crystals.
  • Fourier analysis of dynamic images provides comprehensive acoustic property extraction.
  • This technique enables detailed study of wave dynamics in engineered acoustic materials.