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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|
|Authors: ||SINGH, BP|
|Issue Date: ||1999|
|Publisher: ||E D P SCIENCES|
|Citation: ||EUROPHYSICS LETTERS, 45(4), 456-462|
|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.|
|Appears in Collections:||Article|
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