Tunable conversion from saturable absorption to reverse saturable absorption in poly (pyrrole methine) derivatives

Abstract

Four kinds of poly (pyrrole methine) derivatives were synthesized.Nonlinear optical absorption studies of these polymers are investigated at 800 nm with the Z-scan technique and femtosecond laser pulses. These derivatives show tunable conversion from saturable absorption (SA) to reverse saturable absorption (RSA). The conversion from SA to RSA depends on not only the intensity but also the polymer structure. Electronic donor methyl groups in the pyrrole methine chain enhance the electron density distribution in the backbone of the polymer, and electron-rich thienyl group improves electron transition.These groups lead to a red shift in linear absorption, a reduction of E g and an improvement of electron transition and nonlinear absorption coefficient b.

Nonlinear Optical Properties of Novel Polypyrrole Derivatives Bearing Different Aromatic Segments

“…Recently, polypyrrole (PPy) has been regarded as a typical representative of conducting polymer for electronic applications [8]. In addition, PPy and its derivatives are promising materials for rechargeable batteries, high-capacity electrode, biosensors and immune sensors for its excellent properties, such as high conductivity, controllable chemical and electrochemical properties, good environmental stability and easy processability [9] [10].…”

Investigation of Regulating Third-Order Nonlinear Optical Property by Coordination Interaction

“…There are many mechanisms about the generation of NLO phenomena, such as excited state absorption (ESA), two-photon absorption (TPA), nonlinear scattering, etc. − In order to gain insight into the mechanisms of metal ions on the NLO properties, pump–probe measurement was carried out at 532 nm. Generally speaking, the five-energy-level model (Figure S14) can be used to describe the nonlinear absorption caused by transitions between excited states.…”

A Polypyrrole Hybrid Material Self-Assembled with Porphyrin: Facial Synthesis and Enhanced Optical Limiting Properties

“…In the present case, the Z-scan of PPy, Tpp(OH) 4 and PPy/Tpp(OH) 4 nanocomposite were measured under nanosecond pulse conditions at 532 nm, in the nanosecond regime, PPy showed a typical SA effect, which mainly resulted from the superior electric conductivity [5] and excited-state absorption [9], while the porphyrin moiety Tpp(OH) 4 exhibited a RSA performance, which might arise from the excited-state absorption [48], the result was interestingly semblable with other chromophore such as phthalocyanine and other porphyrin [49]. After the self-assembled synthesis of PPy/Tpp(OH) 4 nanocomposite, all of these combination mechanisms will play an indispensable role at strengthening the nonlinearity effect of as-synthesized PPy/Tpp(OH) 4 nanohybrid.…”

“…Many efforts have been putted to solve this urgent issue, and one of the most effective methods is the functionalization of polypyrrole materials with soluble molecules [8]. In the present case, we synthesized modified polypyrrole (PPy) with a modification of previously reported method [9].…”