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SCATMECH > Classes and Functions >
Surface Scattering Models
> RCW_BRDF_Model
class
RCW_BRDF_Model
The class RCW_BRDF_Model provides a BRDF_Model
interface to the RCW_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 |
| order |
int |
The
Fourier order considered in the calculation. The
calculation will expand the electric and magnetic fields in a
layer from -order to order. |
25 |
| grating |
Grating_Ptr |
A
description of the grating profile and optical
properties. |
Single_Line_Grating |
See also:
SCATMECH Home, Conventions, BRDF_Model,
RCW_Model,
Grating
M.G. Moharam, E.B. Grann, D.A. Pommet, and T.K. Gaylord,
"Formulation for stable and efficient implementation of the
rigorous coupled-wave analysis of binary gratings," J. Opt.
Soc. Am. A 12, 1068-1076 (1995).
P. Lalanne and G.M. Morris, "Highly improved convergence of
the coupled-wave method for TM polarization" J. Opt. Soc.
Am. A 13, 779-784 (1996).
G. Granet and B. Buizal, "Efficient implementation of the coupled-wave method
for metallic lamellar gratings in TM polarization," J. Opt. Soc. Am. A 13, 1019-1023 (1996).
L. Li, "Use of Fourier series in the analysis of discontinuous periodic structures," J. Opt. Soc. Am. A 13, 1870-1876 (1996).
Include file:
#include "rcw.h"
Source code:
rcw.cpp
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Current SCATMECH version: 7.22 (April 2021)
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