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Dendrimer molecules with record large two-photon absorption cross section
We report what is to our knowledge a record high value for an intrinsic two-photon absorption (TPA) cross section, s 2 11 3 10 247 cm 4 s photon 21 molecule 21 , measured with femtosecond pulses in a new dendrimer molecule comprising 29 repeat units of 4,4 0 -bis(diphenylamino)stilbene chromophore. We measure the dependence of TPA on excitation wavelength in three consecutive generations of the dendrimer and show that the maximum s 2 value increases faster than the total number of stilbenedoi:10.1364/ol.26.001081 pmid:18049526 fatcat:vst7vmrxkjgyhjkg3yw3rd6qh4