Picosecond absorption relaxation—central to many disciplines—is typically measured by ultrafast (femtosecond or picosecond) pump-probe techniques, which however are restricted to optically thin and weakly scattering materials or require artificial sample preparation. Here, we developed a reflection-mode relaxation photoacoustic microscope based on a nanosecond laser and measured picosecond absorption relaxation times. The relaxation times of oxygenated and deoxygenated hemoglobin molecules, both possessing extremely low fluorescence quantum yields, were measured at 576 nm. The added advantages in dispersion susceptibility, laser-wavelength availability, reflection sensing, and expense foster the study of natural—including strongly scattering and nonfluorescent—materials.
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18 October 2010
Research Article|
October 18 2010
Picosecond absorption relaxation measured with nanosecond laser photoacoustics
Amos Danielli;
Amos Danielli
Department of Biomedical Engineering, Optical Imaging Laboratory,
Washington University in St. Louis
, One Brookings Drive, St. Louis, Missouri 63130, USA
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Christopher P. Favazza;
Christopher P. Favazza
Department of Biomedical Engineering, Optical Imaging Laboratory,
Washington University in St. Louis
, One Brookings Drive, St. Louis, Missouri 63130, USA
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Konstantin Maslov;
Konstantin Maslov
Department of Biomedical Engineering, Optical Imaging Laboratory,
Washington University in St. Louis
, One Brookings Drive, St. Louis, Missouri 63130, USA
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Lihong V. Wang
Lihong V. Wang
a)
Department of Biomedical Engineering, Optical Imaging Laboratory,
Washington University in St. Louis
, One Brookings Drive, St. Louis, Missouri 63130, USA
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a)
Electronic mail: lhwang@seas.wustl.edu.
Appl. Phys. Lett. 97, 163701 (2010)
Article history
Received:
July 21 2010
Accepted:
September 16 2010
Citation
Amos Danielli, Christopher P. Favazza, Konstantin Maslov, Lihong V. Wang; Picosecond absorption relaxation measured with nanosecond laser photoacoustics. Appl. Phys. Lett. 18 October 2010; 97 (16): 163701. https://doi.org/10.1063/1.3500820
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