Which scattering occurs only in the backward direction?

stimulated Brillouin scattering
For example, stimulated Brillouin scattering in optical fibers is normally possible only in backward direction. The injected lower-frequency backward wave experiences amplification in that process; the same holds for the involved acoustic wave….

What is backscatter effect?

In physics, backscatter (or backscattering) is the reflection of waves, particles, or signals back to the direction from which they came.

How are forward and backward scattering patterns classified?

The scattering pattern is classified into both a forward scattering pattern method and a backward scattering pattern method. In the case of the forward scattering pattern method, the sample is immersed in an index-matching oil and the forward scattering pattern is observed.

Is the forward scattering method suitable for precise measurements?

However, since the backward scattering pattern is tainted by externally reflected light, it is not suitable for precise measurements. Furthermore, the accuracy of this method is very sensitive to the elliptical deformation of the core cross section.

How does size affect the direction of scattering?

The larger the particle, the more it scatters in the forward direction relative to the backward direction. • For particles (or molecules) much smaller than the wavelength, dipole separation is much smaller than wavelength, so phase differences are small, and scattering is roughly the same in all directions.

How does a dipole array explain forward scattering?

Scattering by a dipole array • Explains forward scattering by particles of similar size or larger than the wavelength of incident light. The larger the particle, the more it scatters in the forward direction relative to the backward direction.

https://www.youtube.com/watch?v=ULRTwOMwLoA