Lens

Lens(T, f, na, ref)

Initializes a multilayer structure.

• T number type specifing data precision. Ex: Float32, BigFloat, ... The default is Float64;
• f - defines the lens focal length in meters. A function or interpolation object can be used to describe a focal length wavelength dependent.
• na - defines the lens numerical aperture. A function or interpolation object can be used to describe a focal length wavelength dependent.
• ref - ReferenceFrame specifying the lens position and orientation. The focal planes are located at the plus and minus the focal length.

Examples:

lens = Lens(10E-3, 0.5, ReferenceFrame(0,0,0,0,0))

f(λ) = 10E-3 * λ
na(λ) = .1 * λ
lens = Lens(f, na, ReferenceFrame(0,0,0,0,0))

(field_back, field_forward)= coefficient_general(lens, angspe)

Calculates the field after propagating through the lens assuming the incident field direction of propagation. The model propagates from a focal plane to the other focal plane. The order is based on the light direction of propagation.

• Type: Transmission matrices is diagonal. No reflection matrix is computed (the model does not assume light reflection by the lens)
• Time: very short; scales with length(angspe.nsx_X) length(angspe.nsy_Y)
• RAM: very small; scales with length(angspe.nsx_X) length(angspe.nsy_Y)
• Convergence: sampling of angspe.nsx_X and angspe.nsy_Y