title: Two-photon polymerization of polydiacetylene.
abstract: We show that visible light can polymerize diacetylene monomers into polydiacetylene (PDA) in a two-photon process. We monitor the process by measuring Raman intensities of PDA using a Raman laser at 633 nm with variable intensity I and show that the Raman cross section at short times increases as I3, corresponding to a two-photon process. The process generates a relatively stable blue phase PDA, in contrast with UV polymerization that leads to a fast blue to red phase transformation.
authors.affiliation: Department of Physics, Ilse Katz Institute for Nanoscience and Nanotechnology, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel.
authors.forename: Olga
authors.initials: O
authors.lastname: Shusterman
authors.forename: Amir
authors.initials: A
authors.lastname: Berman
authors.forename: Yuval
authors.initials: Y
authors.lastname: Golan
authors.forename: Baruch
authors.initials: B
authors.lastname: Horovitz
authors.forename: Leila
authors.initials: L
authors.lastname: Zeiri
mesh_terms: D003116:Color; D055668:Photochemical Processes; D017785:Photons; D000078789:Polyacetylene Polymer; D011108:Polymers / Q000737:chemistry*; D053279:Polyynes / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
chemical_list: D000078789:Polyacetylene Polymer; D011108:Polymers; D053279:Polyynes; C082361:polydiacetylene