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Harapriya Rath1, Jeyaraman Sankar, Viswanathan Prabhuraja

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Researchers measured two-photon absorption cross-sections (TPACS) in expanded porphyrin analogues. These aromatic molecules exhibit some of the largest nonlinear optical responses ever recorded for organic compounds.

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Area of Science:

  • Nonlinear Optics
  • Materials Science
  • Organic Chemistry

Background:

  • Expanded porphyrins are a class of organic molecules with unique photophysical properties.
  • Third-order nonlinear optical (NLO) properties are crucial for applications in optical switching, data storage, and telecommunications.
  • Two-photon absorption (TPA) is a key phenomenon determining NLO response, quantified by TPA cross-sections (TPACS).

Purpose of the Study:

  • To investigate the third-order nonlinear optical response of aromatic core-modified expanded porphyrin analogues.
  • To determine the two-photon absorption cross-sections (TPACS) for these novel porphyrin structures.
  • To assess the potential of these molecules for advanced photonic applications.

Main Methods:

  • Utilized a femtosecond open aperture Z-scan technique to measure nonlinear optical properties.
  • Synthesized and characterized a series of aromatic core-modified expanded porphyrin analogues.
  • Analyzed the obtained data to calculate TPACS values.

Main Results:

  • Reported the third-order nonlinear optical response of the studied porphyrin analogues.
  • Measured TPACS values for these molecules.
  • The obtained TPACS values are among the largest reported for any organic molecules in the literature.

Conclusions:

  • Aromatic core-modified expanded porphyrins exhibit exceptionally strong two-photon absorption.
  • These findings highlight the potential of these porphyrin analogues as promising materials for nonlinear optical applications.
  • The reported TPACS values set a new benchmark for organic chromophores in photonics.