Difference between revisions of "Brillouin scattering"

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(Created page with "'''Brillouin scattering''', named after Léon Brillouin, occurs when light, passing through a transparent medium interacts with that medium's periodic spatial & temporal v...")
 
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== See also ==
 
== See also ==
  
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* [[Brillouin zone]]
 
* [[Light]]
 
* [[Light]]
 
* [[Raman scattering]]
 
* [[Raman scattering]]

Latest revision as of 17:08, 10 September 2016

Brillouin scattering, named after Léon Brillouin, occurs when light, passing through a transparent medium interacts with that medium's periodic spatial & temporal variations producing that medium's refractive index.

Description

As described in optics, the index of refraction of a transparent material changes under deformation (compression-distension or shear-skewing).

The result of the interaction between the light-wave and the carrier-deformation wave is that a fraction of the transmitted light-wave changes its momentum (thus its frequency and energy) in preferential directions, as if by diffraction caused by an oscillating 3-dimensional diffraction grating.

If the medium is a solid crystal, a macromolecular chain condensate or a viscous liquid or gas, then the low frequency atomic-chain-deformation waves within the transmitting medium (not the transmitted electro-magnetic wave) in the carrier (represented as a quasiparticle) could be for example:

  • Mass oscillation (acoustic) modes (called phonons);
  • Charge displacement modes (in dielectrics, called polarons);
  • Magnetic spin oscillation modes (in magnetic materials, called magnons).

See also

External links