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IEVref: | 705-03-20 | ID: | |

Language: | en | Status: backup | |

Term: | complex refractive index (in a given direction) | ||

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Definition: | a dimensionless complex scalar quantity , characteristic of a medium at a given point and in a given direction, when there can exist in the medium a sinusoidal electromagnetic wave whose wave vector $\overrightarrow{\underset{\_}{K}}$ has colinear real and imaginary parts $\overrightarrow{{K}^{\prime}}$ and $\overrightarrow{{K}^{\u2033}}$, in the given direction; this quantity is defined by the equation:n$\overrightarrow{\underset{\_}{K}}=\overrightarrow{{K}^{\prime}}+\mathrm{j}\overrightarrow{{K}^{\u2033}}=\underset{\_}{n}\frac{\omega}{{c}_{0}}\overrightarrow{u}$
where NOTE 1 – For an isotropic medium, the complex refractive index is the square root of the product of the relative complex permittivity and the relative complex permeability. NOTE 2 – For each direction in an anisotropic medium, there are generally two distinct wave vectors and two values of the complex refractive index. | ||

Publication date: | 1995-09 | ||

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$\overrightarrow{\underset{\_}{K}}=\overrightarrow{{K}^{\prime}}+\mathrm{j}\overrightarrow{{K}^{\u2033}}=\underset{\_}{n}\frac{\omega}{{c}_{0}}\overrightarrow{u}$

where *ω* is the angular frequency, *c*_{0} is the velocity of propagation of electromagnetic waves in vacuum and $\overrightarrow{u}$ is the unit vector in the given direction

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