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Reverse saturable absorption and anti-Stokes fluorescence in mesoionic compounds pumped at 532 nm
N Rakov1, C B de Araújo, G B Rocha
1Universidade Federal de Pernambuco, 50 670-901 Recife, PE, Brazil.
Applied Optics
|March 22, 2008
Summary
Mesoionic compounds exhibit reverse saturable absorption and anti-Stokes fluorescence. Quantum chemistry explains these nonlinear optical properties, crucial for optical limiting applications.
Area of Science:
- Nonlinear Optics
- Photophysics
- Quantum Chemistry
Background:
- Mesoionic compounds are organic molecules with unique electronic properties.
- Understanding their nonlinear optical behavior is key for advanced photonic materials.
Purpose of the Study:
- To investigate reverse saturable absorption and fluorescence in mesoionic compounds.
- To elucidate the underlying photophysical mechanisms using theoretical calculations.
Main Methods:
- Experimental excitation of liquid solutions at 532 nm.
- Measurement of intensity-dependent transmittance and anti-Stokes fluorescence.
- Quantum-chemistry calculations to determine energy levels and transitions.
Main Results:
- Observed reverse saturable absorption and anti-Stokes fluorescence.
- Attributed phenomena to excited-state absorption.
- Determined nonlinear absorption coefficient and saturation intensity.
Conclusions:
- Mesoionic compounds display significant nonlinear optical properties.
- Excited-state absorption is the primary mechanism.
- Quantum chemistry provides a robust framework for understanding these effects.
