Molecular Engineering of Push-Pull Chromophores

The following sections are included:

• Introduction

• The Two-Form Two-State Model of Push-Pull Molecules

  • Presentation of the 2F2S model

  • Static polarizabilities in the 2F2S model

  • Parameters of the 2F2S model : experimental determination

• Two-Form Two-State Guidelines for the Molecular Engineering of δα(0), β(0) or γ(0)

  • Strategy I: optimization of MIX

  • Strategy II: enhancement of the maximum magnitudes

  • Combination of strategies I and II

• Molecular Engineering of β(0): Examples

  • Experimental determinations

  • Strategy I : optimization of MIX and effect on β_max

  • Strategy II : enhancement of β_max and effect on MIX

• Towards Efficient Materials for Photorefractive Applications

  • The prototype push-pull chromophores in PRM

  • The linear, PEO and KEO susceptibility tensors

  • The mechanisms generating the PR effect in PRM

    • The conventional PR contributions in a high-T_g PRM

    • The conventional and non-conventional PR contributions in a low-T_g PRM

  • Figures of merit of push-pull chromophores in PRM

    • General expressions of the figures of merit

    • 2F2S expressions of the figures of merit

  • Two-form two-state guidelines for the molecular engineering of FOM(OB), FOM(PEO) and FOM(KEO)

  • Examples of push-pull polyenes for PRM

    • Molecular engineering of FOM(OB)

    • Molecular engineering of FOM(PEO)

    • Molecular engineering of FOM(KEO)

    • Molecular engineering of FOM_L(PR) and FOM_H(PR)

• Conclusion

• References