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Molecular polariton electroabsorption.

Chiao-Yu Cheng1, Nina Krainova1, Alyssa N Brigeman1

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Strong light-matter coupling in organic microcavities enhances electroabsorption (EA) but does not change the intrinsic optical nonlinearity of organic semiconductors. An unobserved aggregate state influences EA response at high concentrations.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Organic Electronics

Background:

  • Organic semiconductor microcavities exhibit unique optical properties due to light-matter interactions.
  • Electroabsorption (EA) is a key nonlinear optical response sensitive to material properties and cavity effects.

Purpose of the Study:

  • To investigate if strong light-matter coupling alters the nonlinear optical response of organic semiconductor microcavities.
  • To understand the role of molecular concentration and coupling regimes on EA phenomena.

Main Methods:

  • Fabrication and optical characterization of organic microcavities with varying concentrations of squaraine (SQ) molecules.
  • Application of classical transfer matrix modeling to analyze EA response.
  • Investigation of discrepancies between modeling and experimental results at high SQ concentrations.

Main Results:

  • Transfer matrix modeling accurately predicts EA in low-concentration SQ microcavities with weak coupling.
  • Modeling fails for high-concentration SQ microcavities exhibiting strong coupling (vacuum Rabi splitting of [Formula: see text] meV).
  • A dark H-aggregate state below the SQ exciton transition was identified as the cause for the modeling discrepancy at high concentrations.

Conclusions:

  • Strong coupling can manipulate EA in organic microcavities by tuning polariton modes relative to other states.
  • The intrinsic optical nonlinearity of the organic semiconductor is not altered by strong coupling.
  • The presence of aggregate states significantly influences nonlinear optical responses in microcavity systems.