论文标题
被动光声效应
Passive Photoacoustic Effect
论文作者
论文摘要
光声效应是指激光照射引起的声学产生，其中纳秒脉冲激光源通常用于提供样品的瞬时加热和热弹性膨胀。更一般而言，光声产生需要激光源的主动强度调节以产生尖锐的温度梯度，这是产生声波的关键。在本文中，我们提出了一种新型的光声效应，从移动液滴产生了通过非调节连续波激光器产生光声波。当液滴穿过激光点区域时，可以将其加热并瞬间冷却，从而产生光声波。我们将其命名为被动光声效应。理论分析和仿真研究验证了被动光声效应的存在。这种现象可能会在高通量光声细胞仪中发现潜在的应用。
Photoacoustic effect refers to the acoustic generation induced by laser irradiation, where nanosecond pulsed laser source is normally used to provide instantaneous heating and thermoelastic expansion of the sample. More generally, photoacoustic generation requires active intensity modulation of laser source to produce sharp temperature gradient, which is key to generate acoustic wave. In this paper, we propose a novel photoacoustic effect from moving droplet, which generates photoacoustic wave by a non-modulated continuous-wave laser. When the droplet moves through the laser spot area, it can be heated up and cooled down instantaneously, generating photoacoustic waves. We name it passive photoacoustic effect. Theoretical analysis and simulation study validated the existence of passive photoacoustic effect. This phenomenon may find potential application in high-throughput photoacoustic cytometry.
