Publication detail

Tuning Two-Photon Absorption Cross-Section in Model Push-Pull Chromophores

Authors: Ludwig Miroslav | Cvejn Daniel | Fakis M. | Bureš Filip

Year: 2016

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Tuning Two-Photon Absorption Cross-Section in Model Push-Pull Chromophores	Two-photon absorption (2PA), a nonlinear optical phenomenon related to the imaginary part of the third-order nonlinear susceptibility, constitutes the physical origin of numerous applications such as upconverted lasing, two-photon microscopy and imaging, 3D microfabrication and 3D optical data storage, optical limiters etc. In this contribution, we will report on the photophysical and 2PA properties of two tripodal molecules and their quadrupolar and dipolar counterparts in a series of solvents with varying polarity. The molecules possess triphenylamine electron donating group and mono-cyano acceptors while olefinic and acetylenic π-linkers have been used. Branching led to an increase of the molar extinction coefficient and to a slight bathochromic shift of the absorption spectra while the fluorescence quantum yields decrease but they are maintained to relatively high values. Solvatochromic measurements in the tripodal molecules revealed an emitting state with polar nature. In general, the 2PA cross-sections increase upon branching but the observed behavior strongly depends on the type of solvent. The highest 2PA cross sections are obtained in solvents of medium polarity and values as high as 1420 GM are reported.

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