NumericalAperture¶

Type:	float
Range:	[0, inf]
Default:	-/-
Appearance:	optional

Use the numerical aperture $\mathrm{NA}$ to define the range of the incident Fourier spectrum. When not set the entire propagating spectrum is prescribed.

With the notation of the parent section, Fourier modes with

$\begin{eqnarray*} \Re \left(\frac{\pvec{k}_\perp}{k_0} \right) \leq \mathrm{NA} \end{eqnarray*}$

are computed.