Tunable conversion from saturable absorption to reverse saturable absorption in poly (pyrrole methine) derivatives
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 a...
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Veröffentlicht in: | Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2014-11, Vol.2 (42), p.8850-8853 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Online-Zugang: | Volltext |
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Zusammenfassung: | 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 sub(g) and an improvement of electron transition and nonlinear absorption coefficient beta . |
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ISSN: | 2050-7526 2050-7534 |
DOI: | 10.1039/C4TC01627K |