Abstract
Based on the scanning of photothermal optical coherence tomography (PT-OCT), the photothermal behavior of a flowing medium generated by the enhanced absorption of localized surface plasmon resonance of incorporated Au nanorings (NRIs) is observed. In particular, the effects of air bubble generation and thermally induced bubble size oscillation in a flowing medium through the incorporation of Au NRIs and modulated laser illumination are demonstrated. The size oscillation of the air bubble produces the vibration of the flowing medium, which is synchronized with the laser modulation, for generating PT-OCT signal. At the resonance frequency of flowing-medium vibration, the PT-OCT signal reaches the maximum level. The resonance frequency is related to the mass density and viscosity of the flowing medium and is independent of the flow speed of the medium in a vessel. Such a relation can be used for in situ monitoring the mass density and viscosity of a flowing medium.
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Acknowledgments
This research was supported by Ministry of Science and Technology (grants NSC 102-2218-E-002-012-MY3 and NSC 102-2221-E-002-199) and National Health Research Institute (grant NHRI-EX102-10043EI), Taiwan, The Republic of China. Also, it is sponsored by the Excellent Research Project (103R890951 and 103R890952) of National Taiwan University.
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The content of this paper does not have any potential conflict of interest with anyone. This research does not involve any human participant or animal. Also, all the authors have given their approvals to the submission of this paper.
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Chi, TT., Tu, YC., Yu, CK. et al. Photothermal Behaviors of Flowing Media Caused by Localized Surface Plasmon Resonance of Au Nanorings. Plasmonics 10, 1565–1572 (2015). https://doi.org/10.1007/s11468-015-9972-8
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DOI: https://doi.org/10.1007/s11468-015-9972-8