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Journal of Applied Physics : Mechanisms of the ultrasonic modulation of fluorescence in turbid media

By Baohong Yuan, John Gamelin, and Quing Zhu

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Book Id: WPLBN0002169316
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 17 November 2008

Title: Journal of Applied Physics : Mechanisms of the ultrasonic modulation of fluorescence in turbid media  
Author: Baohong Yuan, John Gamelin, and Quing Zhu
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
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Publisher: American Institute of Physics

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John Gamelin, And Quing Zh, B. Y. (n.d.). Journal of Applied Physics : Mechanisms of the ultrasonic modulation of fluorescence in turbid media. Retrieved from http://community.ebooklibrary.org/


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Description: To understand the modulation mechanisms of fluorescence emission induced by ultrasonic waves in turbid media, a mathematical model is proposed and compared with the recent experimental observations of Kobayashi et al. [Appl. Phys. Lett. 89, 181102 (2006) ]. Modulation of fluorophore concentration is considered as the source of the oscillation of fluorescence signals when fluorophore concentration is low enough so that quenching effects can be ignored. By solving the rate equation and photon diffusion equation, quantitative solutions are given to quantify the modulation strength. Our calculations predict that the modulation depth (the ratio of the modulated signal strength to the unmodulated signal strength) can reach 10−4 when ultrasonic pressure with the order of magnitude of megapascals is applied in the ultrasound focal zone. Our model explains the relationship between the modulation strength and the average fluorophore concentration and also predicts a method to measure or image fluorescence lifetime in the turbid medium. When fluorophore concentration is high enough so that fluorescence quenching occurs, the fluorescence modulation is attributed to the modulation of quenching efficiency. Quenching caused by fluorescence resonance energy transfer can lead to a nonlinear relationship between the modulation fluorescence strength and the applied ultrasound strength.

 

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