n and k for Opal-A (bulk)

                   Dispersion Parameters:

ν (cm-1)

γ

4πρ

  471

0.0694

0.2091

  528

0.7532

0.3196

  801

0.0837

0.0235

1100

0.0510

0.1962

1164

0.0565

0.0338

1204

0.0426

0.0198

1235

0.0302

0.0098

            ε0=1.6026

          

 

 

 

 

 

measured spectrum                    modeled spectrum                     n                             k