# Linear polarization

 related topics {math, energy, light} {math, number, function}

In electrodynamics, linear polarization or plane polarization of electromagnetic radiation is a confinement of the electric field vector or magnetic field vector to a given plane along the direction of propagation. See polarization for more information.

Historically, the orientation of a polarized electromagnetic wave has been defined in the optical regime by the orientation of the electric vector, and in the radio regime, by the orientation of the magnetic vector.

### Mathematical description of linear polarization

The classical sinusoidal plane wave solution of the electromagnetic wave equation for the electric and magnetic fields is (cgs units)

for the magnetic field, where k is the wavenumber,

is the angular frequency of the wave, and c is the speed of light.

Here

is the amplitude of the field and

is the Jones vector in the x-y plane.

The wave is linearly polarized when the phase angles $\alpha_x^{ } , \alpha_y$ are equal,

This represents a wave polarized at an angle θ with respect to the x axis. In that case the Jones vector can be written

The state vectors for linear polarization in x or y are special cases of this state vector.

If unit vectors are defined such that

and

then the polarization state can written in the "x-y basis" as

### References

• Jackson, John D. (1998). Classical Electrodynamics (3rd ed.). Wiley. ISBN 0-471-30932-X.

### See also

This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".

Full article ▸

 related documents Rheology Positron Albireo Atlas (moon) Electro-optic effect Transport phenomena Electrical length Gegenschein Angular acceleration Antenna effective area Diurnal motion Space observatory Naiad (moon) Spheroid North Star Atomic, molecular, and optical physics Collision Ohmmeter Frustum Nova Iapetus (moon) Cutback technique Gouraud shading Fomalhaut Ephemeris time Superluminal communication Orrery Optical path length Mariner 5 Giuseppe Piazzi