Simple layer ARC

Cornu

Cauchy

Ref. ind. $n_{arc}=\sqrt{n_0\cdot n_{Si}}$

$n\left(\lambda \right)=1.725+\frac{134}{\lambda -77.3}$

$n\left(\lambda \right)=1.856+\frac{2.79\times {10}^4}{{\lambda }^2}+\frac{5.73\times {10}^9}{{\lambda }^4}$

thickness $e_{arc}=\frac{\lambda }{4n_{car}}$

$e\left(\lambda \right)=0.144\lambda -11.12$

$e_{arc}=0.135\cdot \lambda \cdot \frac{1}{1+\frac{2.5\times {10}^4}{{\lambda }^2}}$