Optical power limiting properties of two-photon absorbing fluorene and dithienothiophene-based chromophores

Kwang Sup Lee, Hyun Kwan Yang, Jong Hyup Lee, Oh Kil Kim, Han Young Woo, Heayoung Choi, Myoungsik Cha, Mireille Blanchard-Desce

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


We have synthesized efficient two-photon absorbing fluorene and dithienothiophene (DTT) derivatives with electron donors (D) or electron acceptors (A) which are attached symmetrically or asymmetrically at the both end of conjugated links, forming D-π-D and D-π-A structures. The two-photon absorption (TPA) cross-section values (σ) of these chromophores were evaluated by the nonlinear transmission measurements using 8 ns laser pulse, and also by the two-photon-induced fluorescence method with 80 fs pulse laser. The σ values obtained were larger by the nanosecond pulse laser than that by the femtosecond laser. This result suggests that the relative contribution of the excited state absorption becomes more manifested when longer time scale pulses are used. The strong nonlinear absorption including TPA of all these materials induced an efficient optical power limiting (OPL) activity. The trend in OPL behavior agreed well with the size of the TPA intensity.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
Externally publishedYes
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Organic Photonic Materials and Devices V - San Jose, CA, United States
Duration: 2003 Jan 272003 Jan 30


  • Dithienothiophene
  • Optical power limiting activity
  • Two-photon absorption; fluorene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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