From Event: SPIE Organic Photonics + Electronics, 2016
We report femtosecond light-induced macromolecular self-assembly (FLIMSA), which is observed when a high peak intensity femtosecond laser beam propagates through aqueous solution of pseudoisocyanine iodide (PIC) J-aggregates and induces the formation of 0.1 – 1.0 mm-size tube-like structure surrounding the laser beam, while at the same time allowing the beam to continue propagating without obstruction or scattering. The FLIMSA material is morphologically heterogeneous and gel-like and is formed at the margins rather than at the center of the beam. As a potential explanation of this effect we assume that the FLIMSA is induced by the high photon flux gradient characteristic of the femtosecond laser beam periphery. This hypothesis is corroborated by control experiments, where J-aggregate samples were illuminated with nanosecond laser sources with a varying pulse duration, power- and beam shape characteristics, but where no FLIMSA formation was observed.
Aleksander Rebane and Alexander Mikhaylov, "Femtosecond light-induced macromolecular self-assembly," Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390D (Presented at SPIE Organic Photonics + Electronics: September 01, 2016; Published: 23 September 2016); https://doi.org/10.1117/12.2237867.
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