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19 February 2018 Influence of the excited state lifetimes on the photoacoustic signal
Gregor Langer, Thomas Berer
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Proceedings Volume 10494, Photons Plus Ultrasound: Imaging and Sensing 2018; 1049465 (2018) https://doi.org/10.1117/12.2290109
Event: SPIE BiOS, 2018, San Francisco, California, United States
Abstract
In this paper we discuss the influence of the excited state lifetimes of molecules onto the photoacoustic signal generation. Usually, photoacoustic signal generation is performed either with nanosecond laser pulses or modulation frequencies in the MHz up to the GHz regime. The molecules’ singlet relaxation times typically lie in the order of nanoseconds, while triplet lifetimes can be considerably longer. As both time scales, i.e. the laser pulse duration used for excitation and the relaxation times, lie in the same order of magnitude there exists an influence of the excited state lifetimes onto the photoacoustic signal generation. Here, we theoretically discuss at which frequencies this influence becomes significant and what impact this has on the performance and optimum design of photoacoustic microscopes.
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Gregor Langer and Thomas Berer "Influence of the excited state lifetimes on the photoacoustic signal", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 1049465 (19 February 2018); https://doi.org/10.1117/12.2290109
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KEYWORDS
Modulation
Signal attenuation
Molecules
Transducers
Photoacoustic imaging
Photoacoustic microscopy
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