ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Resonant third-order nonlinear optical susceptibility χ(3) of poly-N-vinyl carbazole: 2,4,7-trinitrofluorenone composite polymer photoconductor has been measured at 602 nm for various compositions by picosecond degenerate four-wave mixing. The origin of effective third-order nonlinearity of this system is attributed to the charge–transfer excitation which creates thermalized correlated electron–hole pairs. The optical nonlinearity of this polymeric system is characterized by a long relaxation time of hundreds of picoseconds. A progressive enhancement of the signal intensity and hence effective χ(3) accompanied by an increase in the decay rate of the degenerate four-wave mixing signal has been observed with an increase in the mole fraction of trinitrofluorenone.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.456549
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