A Nano-Quantum Photonic Model for Justification of Dispersion in Single   Crystal Film of NPP
  In this paper, we present a nano-quantum photonic model for justification of normal dispersion in a thin crystal film of NPP. In this method, we assume a laser beam consists of a flow of energetic particles. By precise analyzing of photon interaction with pi-electron system of benzene ring in NPP crystal, we will attain refractive index (RI) in any wavelength and compare the results with experimental data. 
Hassan Kaatuzian, AliAkbar Wahedy Zarch