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|Title:||Observation of tunable two-photon induced excited-state and three-photon absorption phenomena by structure in oligomerfluorene derivatives|
|Citation:||Ouyang, X., Huo, Y., Lu, L., Ge, Z., Ji, W. (2011-12). Observation of tunable two-photon induced excited-state and three-photon absorption phenomena by structure in oligomerfluorene derivatives. Applied Physics A: Materials Science and Processing 105 (4) : 891-895. ScholarBank@NUS Repository. https://doi.org/10.1007/s00339-011-6538-2|
|Abstract:||The nonlinear optical properties, including two-, three-photon and excited-state absorption phenomena, were observed in three oligomerfluorene derivatives (abbreviated as OF3, OF5 and OF7) by femtosecond (450 fs) laser pulses. Their two-, three-photon and, excited-state absorption properties were studied by open Z-scan and pump-probe measurements. Interestingly, when the numbers of fluorene units increased from 3 to 5, and to 7, the corresponding absorption phenomena changed from three-photon to two-photon induced excited-state phenomena, showed strong structure dependence in these derivatives. The results offer a method to design and synthesize organic molecules for multiphoton materials. It was noted that the three-photon cross-section value (δ 3) of OF3 was up to 1.36×10 -76 cm 6s 2. Correspondingly, the two-photon (δ 2) and excited-state cross-section (δ e ) values of OF5 and OF7 also were obtained, and they were 1230 GM and 0.91×10 -18 cm 2 for OF5, and 1780 GM and 1.18×10 -18 cm 2 for OF7, respectively. © 2011 Springer-Verlag.|
|Source Title:||Applied Physics A: Materials Science and Processing|
|Appears in Collections:||Staff Publications|
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