Polar Plot Representation for Frequency-Domain Analysis of Fluorescence Lifetimes |
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Authors: | Glen?I?Redford Email author" target="_blank">Robert?M?CleggEmail author |
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Institution: | (1) Physics Department, University of Illinois, Urbana-Champaign, Illinois;(2) Loomis Laboratory-Physics, 1110 West Green Street, Urbana-Champaign, Illinois |
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Abstract: | We present applications of polar plots for analyzing fluorescence lifetime data acquired in the frequency domain. This graphical,
analytical method is especially useful for rapid FLIM measurements. The usual method for sorting out and determining the underlying
lifetime components from a complex fluorescence signal is to carry out the measurement at multiple frequencies. When it is
not possible to measure at more than one frequency, such as rapid lifetime imaging, specific features of the polar plot analysis
yield valuable information, and provide a diagnostic visualization of the participating fluorescent species underlying a complex
lifetime distributions. Data are presented where this polar plot presentation is useful to derive valuable, unique information
about the underlying component distributions. We also discuss artifacts of photolysis and how this method can also be applied
to samples where each fluorescence species shows a continuous distribution of lifetimes. Polar plots of frequency-domain data
are commonly used for analysis of dielectric relaxation experiments (Cole–Cole plots), which have proved to be exceptionally
useful in that field for decades. We compare this analytical tool that is well developed and extensively used in dielectric
relaxation and chemical kinetics to fluorescence measurements. |
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Keywords: | Fluorescence lifetimes frequency-domain FLIM polar plot |
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