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Cocrystalline Polymer Films Exhibiting Second-Order Nonlinear Optical Properties.

Yifan Xu1, Rui Zu1, Neela H Yennawar2

  • 1Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

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Researchers developed a novel method for creating nonlinear optical (NLO) materials by cocrystallizing polymers with NLO chromophores. This hybrid approach yields materials with significant second harmonic generation (SHG) properties for advanced optical applications.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Advanced polymer materials with specific properties are crucial for optical telecommunication and computing.
  • Existing nonlinear optical (NLO) materials often rely on electric-field poling of chromophores within polymer matrices.
  • Significant advances in NLO materials have been achieved, but novel approaches are continuously sought.

Purpose of the Study:

  • To introduce an alternative and effective method for creating NLO materials.
  • To explore the cocrystallization of NLO chromophores with polymers to form hybrid host-guest complexes.
  • To investigate the second harmonic generation (SHG) properties of these novel hybrid materials.

Main Methods:

  • Cocrystallization of poly(ethylene oxide) (PEO) with 2-chloro-4-nitroaniline (CNA) to form a noncentrosymmetric hybrid complex.
  • Fabrication of hybrid PEO/CNA films.
  • Characterization of SHG activity and its temperature dependence.

Main Results:

  • The PEO/CNA cocrystal formed a noncentrosymmetric unit cell, enabling acentric alignment of the NLO chromophore.
  • The hybrid films exhibited significant second harmonic generation (SHG) activity.
  • SHG intensity decreased to zero upon sample melting as the cocrystal orientation randomized, demonstrating temperature-dependent behavior.

Conclusions:

  • Cocrystallization offers an innovative approach to impart SHG properties to materials.
  • Formation of hybrid host-guest complexes allows for alignment and maintenance of cocrystalline domain orientation.
  • This method provides a new pathway for developing advanced materials for optical applications.