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Quasi-phase-matching in chiral materials

Busson1, Kauranen, Nuckolls

  • 1Laboratory of Chemical and Biological Dynamics and Center for Research on Molecular Electronics and Photonics, University of Leuven, B-3001 Heverlee, Belgium.

Physical Review Letters
|October 4, 2000
PubMed
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Chiral materials

Area of Science:

  • Nonlinear optics
  • Materials science
  • Chirality

Background:

  • Chirality in materials leads to enantiomers with opposite second-order nonlinear optical coefficients.
  • Conventional quasi-phase-matching relies on polar order, not inherent material chirality.

Purpose of the Study:

  • To demonstrate quasi-phase-matched frequency conversion using alternating chiral enantiomers.
  • To explore chirality-driven nonlinear optical effects for new device applications.

Main Methods:

  • Fabrication of Langmuir-Blodgett films with alternating helicenebisquinone enantiomers.
  • Second-harmonic generation experiments to measure nonlinear optical coefficients.

Main Results:

  • Successfully demonstrated second-harmonic generation in alternating enantiomer films.

Related Experiment Videos

  • Observed nonlinear optical coefficients consistent with chirality-induced effects.

    • Conclusions:

    • Alternating chiral enantiomer structures enable quasi-phase-matched frequency conversion.
    • Chirality, rather than polar order, can drive both nonlinear response and phase-matching in optical devices.