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Related Experiment Videos

Second-order nonlinear optical coefficient of polyphosphazene-based materials: a theoretical study.

Denis Jacquemin1, Olivier Quinet, Benoît Champagne

  • 1Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium. denis.jacquemin@fundp.ac.be

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

The nonlinear optical properties of polyphosphazene oligomers were calculated. Replacing backbone nitrogen with silicon significantly enhances optical coefficients, offering potential for new materials.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Optics

Background:

  • Polyphosphazenes are a versatile class of polymers with tunable properties.
  • Nonlinear optical (NLO) materials are crucial for advanced photonic applications.
  • Understanding structure-property relationships is key to designing efficient NLO materials.

Purpose of the Study:

  • To computationally determine the second-order nonlinear optical (NLO) coefficient of polyphosphazene oligomers.
  • To investigate the influence of chain length, backbone modification, and side groups on NLO properties.
  • To rationalize the observed NLO responses based on electronic structure.

Main Methods:

  • Ab initio quantum chemical calculations were employed.
  • Electron correlation and frequency dispersion effects were included.

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  • Systematic variation of oligomer size, backbone composition (N vs. Si), and side groups (H, CH3, F, Cl, Br, OH).

    • Main Results:

    • The first hyperpolarizability per unit cell rapidly converges with increasing chain length.
    • Polyphosphazenes exhibit NLO coefficients approximately one-third of classical push-pull systems.
    • Replacing backbone nitrogen with silicon significantly enhances the first hyperpolarizability.
    • Side group identity influences the first hyperpolarizability through alterations in bond lengths and atomic charges.

    Conclusions:

    • Polyphosphazene oligomers show promising second-order NLO properties.
    • Silicon-containing polyphosphazenes represent a promising avenue for enhanced NLO materials.
    • The study provides a theoretical framework for designing advanced NLO materials based on polyphosphazene structures.