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Thin racemic 1,1'-Bi-2-naphthol films develop optical activity when exposed to circularly polarized light. Crystallization impacts this effect, with suppressed crystallization enabling enantiomeric selective desorption for optical activity generation.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Chirality Studies

Background:

  • Racemic 1,1 '-Bi-2-naphthol films can exhibit optical activity.
  • Circularly polarized light (CPL) and two-photon absorption are key factors.
  • Crystallization significantly influences material properties and optical responses.

Purpose of the Study:

  • To investigate the emergence of optical activity in thin racemic 1,1 '-Bi-2-naphthol films.
  • To understand the role of crystallization and CPL irradiation.
  • To explore nonlinear optical techniques for probing induced chirality.

Main Methods:

  • Polarization-resolved optical microscopy and scanning electron microscopy (SEM) for morphology analysis.
  • Second harmonic generation circular dichroism (SHG-CD) for nonlinear probing.
  • Systematic investigation across different crystallization regimes.

Main Results:

  • Crystallization exerts opposing effects on optical activity generation.
  • Crystallized samples yield better signal-to-noise but limit optical activity due to self-assembly.
  • Suppression of crystallization reveals enantiomeric selective desorption as the primary mechanism for optical activity generation.
  • An intensity threshold (≈0.7 TW cm-2) was identified for CPL-induced optical activity via desorption.

Conclusions:

  • Enantiomeric selective desorption is crucial for generating optical activity in non-crystallized films.
  • SHG-CD probing reaches its resolution limit when crystallization is suppressed during desorption.
  • Higher-order nonlinear processes above the threshold intensity can impair desorption-induced optical activity.