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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 3 — Apr. 4, 2013

Review of ultrafast fluorescence polarization spectroscopy [Invited]

Yang Pu, Wubao Wang, Richard B. Dorshow, Bidyut B. Das, and Robert R. Alfano  »View Author Affiliations


Applied Optics, Vol. 52, Issue 5, pp. 917-929 (2013)
http://dx.doi.org/10.1364/AO.52.000917


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Abstract

A review is presented on the theory, experiment, and application of the ultrafast fluorescence polarization dynamics and anisotropy with examples of two important medical dyes, namely Indocyanine Green and fluorescein. The time-resolved fluorescence polarization spectra of fluorescent dyes were measured with the excitation of a linearly polarized femtosecond laser pulse, and detected using a streak camera. The fluorescence emitted from the dyes is found to be partially oriented (polarized), and the degree of polarization of emission decreases with time. The decay of the fluorescence component polarized parallel to the excitation beam was found to be faster than that of the perpendicular one. Based on the physical model on the time-resolved polarized emission spectra in nanosecond range first described by Weber [J. Chem. Phys. 52, 1654 (1970)], a set of first-order linear differential equations was used to model fluorescence polarization dynamics and anistropy of dye in picoseconds range. Using this model, two important decay parameters were identified separately: the decay rate of total emission intensity and the decay rate of the emission polarization affected by the rotation of fluorescent molecules causing the transfer of emission polarization from one orthogonal component to another. These two decay rates were separated and extracted from the measured time-resolved fluorescence polarization spectra. The emission polarization difference among dyes arising from different molecular volumes was used to enhance the image contrast.

© 2013 Optical Society of America

OCIS Codes
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.5390) Ultrafast optics : Picosecond phenomena

ToC Category:
Spectroscopy

History
Original Manuscript: September 14, 2012
Manuscript Accepted: September 14, 2012
Published: February 6, 2013

Virtual Issues
(2013) Advances in Optics and Photonics
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Yang Pu, Wubao Wang, Richard B. Dorshow, Bidyut B. Das, and Robert R. Alfano, "Review of ultrafast fluorescence polarization spectroscopy [Invited]," Appl. Opt. 52, 917-929 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-52-5-917


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