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arXiv 2308.04429physics.opticscond-mat.mes-hallcond-mat.mtrl-sciphysics.app-phphysics.chem-ph
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利用光学衍射层析成像进行非稳态测温

Non steady-state thermometry with optical diffraction tomography

Adarsh B Vasista, Bernard Ciraulo, Jaime Ortega Arroyo, Romain Quidant

AI总结:

本文利用光学衍射层析成像测温技术研究金纳米棒微腔系统的非稳态热场,揭示热导率、腔高和脉冲时长的影响,并展示其在复杂三维热源和动态系统中的测温优势。

摘要:

使用无标记光学方法测量局部温度已成为基础研究和应用研究中至关重要的工具。然而,这些方法大多局限于平面热源的稳态测量。但是,达到稳态所需的时间是受热系统体积、热源尺寸以及周围环境热导率共同影响的复杂函数。因此,该时间可能比预期长得多,而且许多相关系统涉及三维热源,从而影响温度反演的可靠性。在此,我们利用光学衍射层析成像(ODT)测温技术,系统研究了由微腔中光激发金纳米棒(AuNRs)组成的模型系统中的热场分布。我们通过实验揭示了周围环境热导率、微腔高度和泵浦脉冲持续时间对微腔热力学的影响。我们将实验观测结果与二维数值模拟和定量相位成像(QPI)测温结果进行了基准对比。我们还展示了ODT测温的优势,即能够测量QPI测温无法获取的热场分布,例如嵌入生物细胞等复杂环境中的非平面热源。最后,我们将ODT测温应用于由微腔中胶体AuNRs组成的复杂动态系统。

英文摘要:

Measurement of local temperature using label-free optical methods has gained importance as a pivotal tool in both fundamental and applied research. Yet, most of these approaches are limited to steady-state measurements of planar heat sources. However, the time taken to reach steady-state is a complex function of the volume of the heated system, the size of the heat source, and the thermal conductivity of the surroundings. As such, said time can be significantly longer than expected and many relevant systems involve 3D heat sources, thus compromising reliable temperature retrieval. Here, we systematically study the thermal landscape in a model system consisting of optically excited gold nanorods (AuNRs) in a microchamber using optical diffraction tomography (ODT) thermometry. We experimentally unravel the effect of thermal conductivity of the surroundings, microchamber height, and pump pulse duration on the thermodynamics of the microchamber. We benchmark our experimental observations against 2D numerical sumulations and quantitative phase imaging (QPI) thermometry. We also demonstrate the advantage of ODT thermometry by measuring thermal landscapes inaccessible by QPI thermometry in the form of non-planar heat sources embedded in complex environments such as biological cells. Finally, we apply ODT thermometry to a complex dynamic system consisting of colloidal AuNRs in a microchamber.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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