$RCWAabsorption

The $RCWAabsorption command is used to define the absorption coefficient in each region with different wavelength. The unit of the absorption coefficient is 1/cm.

$RCWArefractiveindex

[a_{1,1} a_{1,2} a_{1,3}]-lambda1  [a_{1,1} a_{1,2} a_{1,3}]-lambda2                layer1 - Nlambda * xdiv 
[a_{2,1} a_{2,2} a_{2,3}]-lambda1  [a_{2,1} a_{2,2} a_{2,3}]-lambda2                layer2 - Nlambda * xdiv 
...
total layer

The $RCWAabsorption setting in GUI interface is here
1. Press Add new layers for RCWA and fill in the fields as needed!