Two-photon photochromism of an organic material for holographic recording

Kevin D. Belfield, Yong Liu, Raluca A. Negres, Meigong Fan, Guilan Pan, David J. Hagan, Florencio E. Hernandez

Research output: Contribution to journalArticlepeer-review

112 Scopus citations


We report the two-photon-induced photoisomerization of 3-[1-(1,2-dimethyl-1H-indol-3-yl)-ethylidene]-4-isopropylidene- dihydrofuran-2,5-dione (1), a photochromic compound with λmax = 385 nm, using 775-nm femtosecond pulsed laser irradiation. The resulting photoisomer had λmax = 582 nm. The kinetic rate constant for the two-photon-induced electrocyclic isomerization reaction was measured at two different intensities (two different powers), showing a quadratic dependence with respect to the pump intensity. Results of pump-probe solution phase experiments and guest/host polymer thin film interferometric imaging studies are reported. A two-photon absorption molecular cross section σ2 = 10.3 x 10-48 cm4·s/photon was measured using Z-scan, further supporting a two-photon-induced isomerization process. Two-photon-induced interferometric recording in a fulgide-containing polymer film was demonstrated.

Original languageEnglish (US)
Pages (from-to)3663-3667
Number of pages5
JournalChemistry of Materials
Issue number9
StatePublished - Sep 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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