首页|Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames

Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames

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  • 国家科技期刊平台
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The creation of carbonaceous nanoparticles and their dynamics in hydrocarbon flames are still debated in environmental,combustion,and material sciences.In this study,we introduce single-pulse femtosecond laser sheet-compressed ultrafast photography(fsLS-CUP),an ultrafast imaging technique specifically designed to shed light on and capture ultrafast dynamics stemming from interactions between femtosecond lasers and nanoparticles in flames in a single-shot.fsLS-CUP enables the first-time real-time billion frames-per-second(Gfps)simultaneous two-dimensional(2D)imaging of laser-induced fluorescence(LIF)and laser-induced heating(LIH)that are originated from polycyclic aromatic hydrocarbons(PAHs)and soot particles,respectively.Furthermore,fsLS-CUP provides the real-time spatiotemporal map of femtosecond laser-soot interaction as elastic light scattering(ELS)at an astonishing 250 Gfps.In contrast to existing single-shot ultrafast imaging approaches,which are limited to millions of frames per second only and require multiple laser pulses,our method employs only a single pulse and captures the entire dynamics of laser-induced signals at hundreds of Gfps.Using a single pulse does not change the optical properties of nanoparticles for a following pulse,thus allowing reliable spatiotemporal mapping.Moreover,we found that particle inception and growth are derived from precursors.In essence,as an imaging modality,fsLS-CUP offers ultrafast 2D diagnostics,contributing to the fundamental understanding of nanoparticle's inception and broader applications across different fields,such as material science and biomedical engineering.

Yogeshwar Nath Mishra、Peng Wang、Florian J.Bauer、Murthy S.Gudipati、Lihong V.Wang

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Caltech Optical Imaging Laboratory,Andrew and Peggy Cheng Department of Medical Engineering,Department of Electrical Engineering,California Institute of Technology,1200 East California Boulevard,Mail Code 138-78,Pasadena,CA 91125,USA

Science Division,Jet Propulsion Laboratory,California Institute of Technology,4800 Oak Grove Drive,Pasadena,CA 91109,USA

Lehrstuhl für Technische Thermodynamik(LTT)and Erlangen Graduate School in Advanced Optical Technologies(SAOT),Universität Erlangen-Nürnberg,Erlangen 91058,G

Lehrstuhl für Technische Thermodynamik(LTT)and Erlangen Graduate School in Advanced Optical Technologies(SAOT),Universität Erlangen-Nürnberg,Erlangen 91058,Germany

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Swedish Research CouncilJPL was carried out at the Jet Propulsion Laboratory,California Institute of Technology,under a contract with NASAJPL J ROC and NASA SSW programs

IPD2018-0678380NM0018D0004

2024

10.1038/s41377-024-01588-x

光:科学与应用(英文版)
中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCD
ISSN：2095-5545
年,卷(期)：2024.13(10)