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    Area of Science:

    • Photochemistry and Photophysics
    • Supramolecular Chemistry
    • Nonlinear Optics

    Background:

    • Self-assembled coordination complexes offer tunable optical properties.
    • Femtosecond laser spectroscopy is crucial for studying ultrafast photophysical processes.
    • Understanding polarization effects is key for advanced optical materials.

    Purpose of the Study:

    • To investigate the polarization-induced fluorescence modulation of a self-assembled coordination cage.
    • To explore the relationship between light polarization and two-photon-induced fluorescence (TPF).
    • To analyze the nonlinear absorption properties of the complex.

    Main Methods:

    • Femtosecond laser pulses were used to excite the coordination complex.
    • Two-photon-induced fluorescence (TPF) intensity was measured under varying polarization conditions.
    • Femtosecond open aperture Z-scan and nonlinear transmission measurements were performed.

    Main Results:

    • TPF intensity showed strong modulation dependent on incident light polarization.
    • The polarization-induced modulation efficiency decreased with increasing light intensity.
    • Excited-state absorption was identified as a key factor in the observed modulation.

    Conclusions:

    • The study elucidates the polarization-dependent fluorescence modulation in coordination cages.
    • Nonlinear absorption mechanisms, particularly excited-state absorption, significantly influence TPF.
    • The findings contribute to understanding molecular optical properties and potential applications in optical devices.