Broadband Two-Photon Absorption Cross Sections of Benzothiazole Derivatives and Benzobisthiazolium Salts
Eva Noskovičova, Dušan Lorenc, Peter Magdolen, Ivica Sigmundová, Pavol Zahradník, Dušan Velič
Index: 10.1016/j.cplett.2018.03.075
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Abstract
Two-photon absorption (TPA) cross sections of conjugated donor-π-acceptor dipolar structures containing benzothiazole or benzobisthiazolium moieties are determined in a broad spectral range from 700 nm to 1000 nm using two-photon induced fluorescence technique. The TPA cross section values range from 150 GM to 4 600 GM. The largest values are observed in near-infrared region. The dipolar derivative of benzothiazole has the largest TPA cross section of 4 600 GM at wavelength of 890 nm. A combination of the large TPA in the near-infrared region and the high emission quantum yield makes these compounds excellent candidates for two-photon fluorescence microscopy.