Second- and third-order nonlinear optical properties of bis-chalcone derivatives
•2,5-Bis(4-methoxy-benzylidene)-cyclopentanone (CP-POME) showed very high second harmonic generation (SHG) efficiency (5.3 times than that of urea).•All the compounds showed good third order NLO property. 2,5-Bis(cinnamylidene)-cyclopentanone (CP-CAL) exhibited good NLA activity with β coefficient o...
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Published in | Journal of photochemistry and photobiology. A, Chemistry. Vol. 290; pp. 38 - 42 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.09.2014
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Subjects | |
Online Access | Get full text |
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Summary: | •2,5-Bis(4-methoxy-benzylidene)-cyclopentanone (CP-POME) showed very high second harmonic generation (SHG) efficiency (5.3 times than that of urea).•All the compounds showed good third order NLO property. 2,5-Bis(cinnamylidene)-cyclopentanone (CP-CAL) exhibited good NLA activity with β coefficient of 1×10−10m/W.•The NLA observed in the present study is of two photon absorption (2PA) and optical limiting type.•The compounds can have potential applications in sensor and eye protection.
Bis-chalcone derivatives: 2,5-bis(benzylidene)-cyclopentanone (CP-DBA), 2,5-bis(4-methoxy-benzylidene)-cyclopentanone (CP-POME), 2,5-bis(4-isopropyl-benzylidene)-cyclopentanone (CP-ISO) and 2,5-bis(cinnamylidene)-cyclopentanone (CP-CAL) are synthesized by Claisen–Schmidt reaction and characterized using, FT-IR, 1H NMR, 13C NMR, and mass spectroscopic techniques. The second- and third-order nonlinear optical properties of these samples are studied using second harmonic generation and nanosecond open-aperture Z-scan methods. CP-POME has shown a very high second harmonic generation (SHG) efficiency (5.3 times that of urea). These molecules reveal a strong third-order nonlinear absorption (NLA) that is of optical limiting type, due to their peculiar D–π–A–π–D structure that leads to high polarization of the delocalized electron cloud. CP-CAL exhibits highest NLA activity with a β coefficient of 1×10−10m/W. Through numerical simulations, the mechanism of NLA is found to be a two-photon absorption process in the case of all the samples. |
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ISSN: | 1010-6030 1873-2666 |
DOI: | 10.1016/j.jphotochem.2014.06.004 |