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Springer theses

Fluorescence Lifetime

James Keaveney

Published Jan 1, 2014• 0 citations
Publisher
DOI
10.1007/978-3-319-07100-8_8

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We have used photon pair correlations generated via spontaneous parametric downconversion (SPDC) to measure the fluorescence lifetime of the organic dye rhodamine 6 G, demonstrating that fluorescence lifetime measurements can be achieved using a continuous wave (CW) laser, without pulsed or modulated lasers. Our entangled photon method, quantum fluorescence lifetime (Q-FL) measurements, uses one photon to excite fluorescence and the resulting fluorescence photon is timed and referenced to the arrival time of the other entangled photon. Thus, we can exploit the short timescale of photon pair correlations to conduct experiments that are typically carried out with pulsed lasers and we show that the inherent timing of the photons is fast enough to resolve the nanosecond scale fluorescence lifetime of the sample. This measurement paves the way towards using the time correlations of entangled photons for fluorescence imaging; capitalizing on the presence of fast, sub-100 ps correlations that have not been demonstrated classically.

Optics Express•Jul 14, 2023•15 citations
Fluorescence lifetime measurement is an essential process for evaluation and application of optical gain media. An accurate and convenient scheme for fluorescence lifetime measurement of complex emission processes with either single or multiple fluorescence lifetimes is essential. We developed a new convolution-based scheme for fluorescence lifetime measurement. The innovation of the scheme lies in a combination of convolution-based digital signal processing algorithms with a low cost and simple time-domain spectroscopic setup. The convolution-based scheme is able to achieve accurate microsecond fluorescence lifetime resolution using the spectroscopic setup with only millisecond fluorescence lifetime resolution, for both single or multiple fluorescence lifetimes. We demonstrated the performance of the scheme, both theoretically and experimentally, by measuring fluorescence lifetimes associated with complicated emission processes in bismuth-erbium-doped fibers and erbium-doped fiber.
We have used photon pair correlations generated via spontaneous parametric downconversion (SPDC) to measure the fluorescence lifetime of the organic dye rhodamine 6 G, demonstrating that fluorescence lifetime measurements can be achieved using a continuous wave (CW) laser, without pulsed or modulated lasers. Our entangled photon method, quantum fluorescence lifetime (Q-FL) measurements, uses one photon to excite fluorescence and the resulting fluorescence photon is timed and referenced to the arrival time of the other entangled photon. Thus, we can exploit the short timescale of photon pair correlations to conduct experiments that are typically carried out with pulsed lasers and we show that the inherent timing of the photons is fast enough to resolve the nanosecond scale fluorescence lifetime of the sample. This measurement paves the way towards using the time correlations of entangled photons for fluorescence imaging; capitalizing on the presence of fast, sub-100 ps correlations that have not been demonstrated classically.