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==Mathematical description==
The [[Classical physics|classical]] [[sinusoidal]] plane wave solution of the [[electromagnetic wave equation]] for the [[Electric field|electric]] and [[Magnetic field|magnetic]] fields is ([[Gaussian units]])
:<math> \mathbf{E} ( \mathbf{r} , t ) = \left| \mathbf{E} \right| \mathrm{Re} \left \{ |\psi\rangle \exp \left [ i \left ( kz-\omega t \right ) \right ] \right \} </math>
:<math> \mathbf{B} ( \mathbf{r} , t ) = \hat { \mathbf{z} } \times \mathbf{E} ( \mathbf{r} , t ) ,</math>
is the [[angular frequency]] of the wave propagating in the +z direction, and <math> c </math> is the [[speed of light]].▼
▲where <math>k</math> is the [[wavenumber]], <math display=inline> \omega = c k</math> is the [[angular frequency]] of the wave propagating in the +z direction, and <math>
Here <math>| \mathbf{E} |</math> is the [[amplitude]] of the field and
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