polarization


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polarization

, polarisation
Physics the process or phenomenon in which the waves of light or other electromagnetic radiation are restricted to certain directions of vibration, usually specified in terms of the electric field vector

polarization

(poh-lă-ri-zay -shŏn) The degree to which the orientation of the electric or magnetic vector in electromagnetic radiation is predictable over time. In a partially polarized wave, the vector thus shows a less random orientation in the plane perpendicular to the direction of wave motion than occurs in an unpolarized (normal) wave. Waves in which the electric vectors are entirely vertical or horizontal with respect to the direction of motion are described as vertically or horizontally plane (or linearly) polarized. In general, both polarizations are present with a relative phase difference and the wave is then elliptically polarized in the right-handed or left-handed sense accordingly as the resultant vector rotates clockwise or counterclockwise when viewed along the direction of motion of the wave; in the case where the resultant vector rotates and its magnitude remains constant, the wave is circularly polarized.

Polarization is a measure of the way in which light or other electromagnetic radiation from a celestial body is affected by factors such as scattering due to cosmic dust or strong stellar or interstellar magnetic fields, or reflection from a surface. Radio emissions from celestial sources are usually partially polarized, i.e. the waves can be considered to be composed of a completely unpolarized component plus a small polarized component. Synchrotron emission, however, may be strongly polarized. The general situation is described by the four Stokes parameters (I, Q, U, and V ), which are defined in such a manner that specifying their four values uniquely describes the state of polarization: I is a measure of the total power in the wave, Q and U define the degree of linear polarization, and V that of circular polarization. All four have dimensions of flux density. See also Faraday rotation; interstellar polarization.

polarization

[‚pō·lə·rə′zā·shən]
(electricity)
The process of producing a relative displacement of positive and negative bound charges in a body by applying an electric field.
A vector quantity equal to the electric dipole moment per unit volume of a material. Also known as dielectric polarization; electric polarization.
A chemical change occurring in dry cells during use, increasing the internal resistance of the cell and shortening its useful life.
(physics)
Phenomenon exhibited by certain electromagnetic waves and other transverse waves in which the direction of the electric field or the displacement direction of the vibrations is constant or varies in some definite way. Also known as wave polarization.
The direction of the electric field or the displacement vector of a wave exhibiting polarization (first definition).
The process of bringing about polarization (first definition) in a transverse wave.
Property of a collection of particles with spin, in which the majority have spin components pointing in one direction, rather than at random.
References in periodicals archive ?
A newer strategy uses specially patterned camera pixels, but this approach does not measure the full polarization state and requires a non-standard imaging sensor.
It is obtained that [t.sub.uu] = [t.sub.vv] and [t.sub.uv] [not equal to] [t.sub.vu], which means that only linear polarization conversion occurs.
To interpret the mechanism of the polarization conversion, the cases of u- and v-polarization incidence are studied.
Single polarization filter characters of the gold-coated and the liquid filled photonic crystal fiber based on surface plasmon resonance.
If media fragmentation is a mere side effect of income inequality, then a study that looks solely at media fragmentation and polarization runs the risk of erroneously attributing increased polarization to media fragmentation when, in fact, income inequality is the cause.
"For example, chiral holograms can be made to display a sequence of certain images only when illuminated with light of specific polarization not known to the forger."
The process of polarization migration mainly involves prestack migration and polarization analysis related to the principal polarization direction, which will be elaborated in the following sections.
The qualitative difference has to do with the nature of the polarization. Unlike in the 1970s, this time we have a much more divisive political narrative coming from the top leadership of the country.
This circular polarization has been measured for the first time for a GRB and is 6 to 7 times weaker than the linear polarization, but much stronger than predicted.
In this work, we combined pairs of channels with different polarizations. The first channel was polarized by a linear polarization of 45[degrees], while the second channel was polarized at 90[degrees] away by a linear polarization of (45[degrees] + 90[degrees]).
When the phase change occurred, the sudden increase in current and consequently in polarization is observed.