光捕获的单个气溶胶粒子中调制Mie散射和光声信号产生之间的耦合

Michael J Gleichweit, Mercede A. Mohajer, Dominique Borgeaud, Matus E. Diveky, G. David, R. Signorell
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引用次数: 1

摘要

光声光谱法和光热光谱法是探测气溶胶粒子吸收系数的两种常用方法,既可以在气溶胶整体上进行,也可以在单粒子水平上进行。在光热光谱中,通常用光电二极管或照相机观察到加热或冷却时粒子的光散射模式的变化。在光声光谱学中,声波对周期性光吸收的响应被记录下来,例如用麦克风。虽然这两种方法通过激发过程密切相关,但检测途径却有本质上的不同。然而,在我们的单粒子光学捕获装置中,我们观察到调制Mie散射(光热效应的结果)和光声光谱之间以前不明显的单向耦合。这种耦合通过声音信号中不同形状的、突然的特征表现出来。我们的分析表明,单个光捕获粒子的光散射与基于光与声谐振器壁相互作用的光声信号产生之间存在非平凡的相互作用。对几种捕获功率和光声激发功率的测量支持这一结论。这种耦合如何表现出来,如形状和强度,可以用经典Mie理论计算的粒子瞬时相函数(散射强度)的结构来最终解释。这使我们能够制定条件,以便在未来的实验中利用或最小化耦合效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coupling between modulated Mie scattering and photoacoustic signal generation in optically trapped, single aerosol particles
Photoacoustic spectroscopy and photothermal spectroscopy are two common methods to probe aerosol particle absorption coefficients and can be performed both on aerosol ensembles and on the single particle level. With photothermal spectroscopy typically changes in the particle’s light scattering pattern upon heating or cooling are observed with photo-diodes or cameras. In photoacoustic spectroscopy, the acoustic response to periodic light absorption is recorded e.g. with a microphone. Although both methods are closely related through their excitation process, the detection pathways are quintessentially different. In our single particle optical trapping setup, however, we observe a previously unnoticeable, unidirectional coupling between modulated Mie scattering (result of the photothermal effect) and photoacoustic spectroscopy. The coupling manifests itself via differently shaped, sudden features in the acoustic signal. Our analysis suggests a non-trivial interaction between light scattering of single, optically trapped particles and the photoacoustic signal generation based on interactions of light with the acoustic resonator’s walls. Measurements over several trapping powers and photoacoustic excitation powers support this conclusion. How the coupling manifests itself, such as shape and strength, can be conclusively explained by the structure of the particle’s momentary phase function (scattering intensity) calculated by classical Mie theory. This allows us to formulate conditions to either utilise or minimise the coupling effects in future experiments.
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