Mechanisms of excited-state enhancement of optical non-linearity in poly(distyrybenzene-co-triethylene glycol)

Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cplett.2004.03.007

Title:	Mechanisms of excited-state enhancement of optical non-linearity in poly(distyrybenzene-co-triethylene glycol)
Authors:	Ma, G. He, J. Tang, S.H.
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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