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A set of ultrathin multilayer films with alternated layers containing Poly[4,4-bis(4-sulfobutyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl]-1,4-phenylene sodium sa (PCPDTPhSO 3 Na) as donor and amine group modified fullerene derivative C 70 -(ethylenediamine) 8  (C 70 -(EDA) 8 ) as acceptor were prepared using layer-by-layer assembly technique on a quartz substrate. Driven by the electrostatic force, C 70 -(EDA) 8  and PCPDTPhSO 3 Na were alternately adsorbed on the substrate to form donor–acceptor periodically overlapping structure. The growth of the film was monitored by UV-Vis absorption spectra, showing regularly consecutive deposition process. The ultrafast third-order nonlinear optical properties of the films were investigated via a 4f coherent imaging system with phase object (NIT-PO) with 190 fs laser pulses at 400 nm. Experimental results demonstrate that the ultrathin films exhibit excellent self-focusing effect (n 2 ∼4.02 × 10 −16  m 2 /W) and reverse saturable absorption properties (β∼7.75 × 10 −10  m/W). Our studies indicate that the PCPDTPhSO 3 Na/C 70 -(EDA) 8  film has significant potential for applications in future nonlinear optical devices.

Ultrafast third-order nonlinear optical properties of self-assembled PCPDTPhSO 3 Na/C 70 -(EDA) 8 periodically overlapping film