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線形光学の関係式

Last updated at Posted at 2023-09-15

忘れちゃう線形光学周りの事項の備忘録

屈折率と誘電関数の関係

複素屈折率$ n + \mathrm{i} \kappa $, 誘電関数$\epsilon = \epsilon_r + \mathrm{i} \epsilon_i$について
$$
n^2 = \frac{\left| \epsilon \right| + \epsilon_r}{2}, \kappa^2 = \frac{\left| \epsilon \right| - \epsilon_r}{2}
$$

$(n+\mathrm{i}\kappa)^2 = \epsilon_r \pm \mathrm{i} |\epsilon_i|$

反射率

垂直入射の反射率

$$
R = \frac{(1-n)^2 + \kappa^2}{(1+n)^2+ \kappa^2} , \theta = \tan^{-1} \left( \frac{2 \kappa}{n^2 + \kappa^2 -1} \right)
$$

吸収係数

$$
\alpha = \frac{2 \omega \kappa}{c}
$$

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