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SCATMECH > Classes and Functions >
Surface Scattering Models
> CrossRCW_BRDF_Model
class
CrossRCW_BRDF_Model
The class CrossRCW_BRDF_Model provides a BRDF_Model
interface to the CrossRCW_Model. Since a periodic structure
yields delta-function-like peaks in the BRDF, the BRDF cannot be strictly evaluated
for such a structure. However, it is sometimes useful to provide a mechanism for
evaluating an effective BRDF. This model provides that interface by spreading the
power of each diffracting order uniformly over a conical solid angle whose
half-angle is given by the parameter alpha.
Parameters:
| Parameter |
Data Type |
Description |
Default |
| lambda |
double |
Wavelength of the light in vacuum [µm].
(Inherited from BRDF_Model). |
0.532 |
| type |
int |
Indicates whether the light is incident from above the
substrate or from within the substrate and whether the
scattering is evaluated in reflection or transmission.
The choices are:
0 : Light is incident from the above the substrate, and scattering is evaluated in reflection.
1 : Light is incident from the above the substrate, and scattering is evaluated in transmission.
2 : Light is incident from the within the substrate, and scattering is evaluated in reflection.
3 : Light is incident from the within the substrate, and scattering is evaluated in transmission.
For 1, 2, and 3, the substrate must be non-absorbing.
(Inherited from BRDF_Model). |
0 |
| substrate |
dielectric_function |
The
optical constants of the substrate, expressed as a
complex number (n,k) or, optionally, as a function of
wavelength.
(Inherited from BRDF_Model). |
(4.05,0.05) |
| alpha |
double |
The half-angle of
a cone over which the power diffracted into
each order is assumed to be spread [rad]. |
0.0175 |
| RCW |
CrossRCW_Model_Ptr |
The CrossRCW_Model used to perform the simulation. |
CrossRCW_Model |
See also:
SCATMECH Home, Conventions, BRDF_Model,
CrossRCW_Model,
CrossGrating
L. Li, "New formulation of the Fourier modal method for crossed surface-relief gratings,"
J. Opt. Soc. Am. A 14, 2758-2767 (1997).
L. Li, "Formulation and comparison of two recursive matrix algorithms for modeling layered diffraction gratings,"
J. Opt. Soc. Am. A 13, 1024-1035 (1996).
Include file:
#include "crossrcw.h"
Source code:
crossrcw.cpp
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Current SCATMECH version: 7.22 (April 2021)
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