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|Title:||Mechanisms of excited-state enhancement of optical non-linearity in poly(distyrybenzene-co-triethylene glycol)||Authors:||Ma, G.
|Issue Date:||11-Apr-2004||Citation:||Ma, G., He, J., Tang, S.H. (2004-04-11). Mechanisms of excited-state enhancement of optical non-linearity in poly(distyrybenzene-co-triethylene glycol). Chemical Physics Letters 388 (1-3) : 105-109. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cplett.2004.03.007||Abstract:||We present femtosecond optical Kerr effect (OKE) studies of the third-order non-linear optical response of poly (distyrybenzene-co-triethylene glycol) (PDTG) under both resonance and off-resonance conditions. The excited-state enhancement of OKE signal was observed under resonance excitation. The temporal behavior of resonant OKE signal was found to be characterized by a fast component with time constant of about 250 fs and a slow component with lifetime of about 420 ps, which are attributed to delocalized π-electron and intra-chain singlet exciton migration among the backbone of the polymer, respectively. The off-resonance OKE signal only was seen to consist of an ultrafast response due entirely to delocalized electrons contribution. © 2004 Elsevier B.V. All rights reserved.||Source Title:||Chemical Physics Letters||URI:||http://scholarbank.nus.edu.sg/handle/10635/97173||ISSN:||00092614||DOI:||10.1016/j.cplett.2004.03.007|
|Appears in Collections:||Staff Publications|
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