Abstract
Two-photon absorption has been measured in a nano-optical material (quantum dots) based on the nonconjugated conductive polymer, iodine-doped poly(β-pinene). The measurement has been made using open-aperture z scan at 730–860nm with 150fs pulses. Exceptionally large two-photon absorption coefficient has been observed with a peak of magnitude ∼2.6cm∕MW that appeared at ∼1.53eV which is close to half of the optical gap corresponding to the charge-transfer transition involving the isolated double bond. Saturation of absorption was observed at lower intensities and shorter wavelengths. The results have been attributed to the quantum dots (subnanometer size) formed upon doping.
Published Version
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