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getindex

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Returns the complex refractive index of a material in the material database. The refractive index at the specified frequency is linearly interpolated from the neighboring frequencies where the data is available.

 

Supported Product: FDTD, MODE, DEVICE

 

Syntax

Description

out = getindex("materialname", f);

Returns the complex index of the material with the given name. The index is returned for the specified frequency f. Frequency f is in Hz.

getindex("materialname", f, component);

Optional argument component can be 1, 2 or 3 to specify the x, y or z component for anisotropic materials. The default is 1.

 

Example

This example shows how to get material (n,k) data with the getindex and getfdtdindex functions. In this case, we compare the experimental data to the fit of the that data that will be used in the simulation.

material="Au (Gold) - CRC";   # material 

source_min_f=c/700e-9;      # source min frequency

source_max_f=c/400e-9;      # source max frequency

f_vector=linspace(source_max_f,source_min_f,100);

 

# get experimental data

n_exp=getindex(material,f_vector);

# get FDTD fit of experimental data

n_fdtd=getfdtdindex(material,f_vector,source_min_f,source_max_f);

 

# plot results

plot(c/f_vector*1e9,real(n_exp),real(n_fdtd),"wavelenth (nm)","n",material);

legend("experimental data","FDTD fit");

plot(c/f_vector*1e9,imag(n_exp),imag(n_fdtd),"wavelenth (nm)","k",material);

legend("experimental data","FDTD fit");

 

# output index data to text file

data=matrix(100,5);

data(1:100,1)=c/f_vector*1e9;

data(1:100,2)=real(n_exp);

data(1:100,3)=imag(n_exp);

data(1:100,4)=real(n_fdtd);

data(1:100,5)=imag(n_fdtd);

write(material+".txt","wavelength_nm exp_n exp_k fdtd_n fdtd_k");

write(material+".txt",num2str(data));

 

See Also

Material database, getfdtdindex, getmodeindex, addmaterial, setmaterial, getsurfaceconductivity

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