Nonlinear optical response of a novel polydiacetylene poly(1,4 bis(3-quinolyl)-1,3 butadyne): Role of exciton-phonon interaction

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Nonlinear optical response of a novel polydiacetylene poly(1,4 bis(3-quinolyl)-1,3 butadyne): Role of exciton-phonon interaction

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Title: Nonlinear optical response of a novel polydiacetylene poly(1,4 bis(3-quinolyl)-1,3 butadyne): Role of exciton-phonon interaction
Author: SINGH, BP; NAMPOOTHIRI, AVV; KUNDU, T; PUNTAMBEKAR, PN; SAHA, D; DHANABALAN, A; TALWAR, SS
Abstract: A model incorporating the exciton-phonon interaction for a quantitative description of the third-order nonlinear optical response of a one-dimensional conjugated polymer chain in the vicinity of a one-photon resonance is proposed. This model has been used to describe our observations on the dispersion of the second molecular hyperpolarizability, gamma (-omega; omega,omega, -omega), of poly(1,4 bis(3-quinolyl))-1,3 butadyne in the spectral range 720-810 nm satisfactorily. The large observed precipitous enhancement close to the absorption tail could not be explained by the essential states models. It is found that the phonon-mediated shift of the exciton resonance is responsible for the large monotonic variation of gamma, whilst the phase space filling effect renders gamma its self-defocusing character.
URI: http://dx.doi.org/10.1209/epl/i1999-00188-3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5862
http://hdl.handle.net/10054/5862
Date: 1999


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