Ideal Lens
Use the Ideal Lens boundary condition to treat a surface as if it were a lens, without having to create a detailed lens geometry.
The selected boundary or boundaries for the Ideal Lens should generally be a single planar surface (in 3D) or a straight edge (in 2D). Use a separate Ideal Lens feature for each lens.
Device Properties
Select an option from the Ideal lens type list: Paraxial surface (the default), Thin lens, or Thick lens.
If Paraxial surface is selected, choose one of the following from the Paraxial surface type list:
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Specify effective focal length (the default): enter a value or expression for the Effective focal length feff (SI unit: m). The default is 100 mm.
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Specify optical power: enter a value or expression for the Optical power K (SI unit: 1/m). The default is 0.1 m-1.
If Thin lens is selected, enter the following:
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Radius of curvature, surface 1 R1 (SI unit: m). The default is 100 mm. This value should be positive for a convex surface or negative for a concave surface.
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Radius of curvature, surface 2 R2 (SI unit: m). The default is 100 mm. This value should be negative for a convex surface or positive for a concave surface.
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Refractive index n (dimensionless). The default is 1.5.
If Thick lens is selected, enter the same parameters as for Thin lens, plus the additional Center thickness Tc (SI unit: m). The default is 0.
Ideal Lens Reference
The ideal lens reference is the pole of the ideal lens. A rays passing through this point will be undeviated. The Ideal lens reference can be selected from a number of options.
Centroid of selection will compute the geometric center of all selected boundaries.
From coordinates will give a point on the ideal lens that is a projection of a user defined point onto a plane containing the ideal lens surface.
Selected point will use the point indicated in the Reference Point Selection section.
See Wall for information on the section New Value of Auxiliary Dependent Variables.