Astrath N G C, Bergmann E V, Anghinoni B, Flizikowski G A S, Novatski A, Jacinto C, Požar T, Kalin M, Malacarne L C, Baesso M L
Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil.
School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, K1N6N5, Canada.
Sci Rep. 2024 Mar 7;14(1):5595. doi: 10.1038/s41598-024-56176-1.
The interaction of localized light with matter generates optical electrostriction within dielectric fluids, leading to a discernible change in the refractive index of the medium according to the excitation's light profile. This optical force holds critical significance in optical manipulation and plays a fundamental role in numerous photonic applications. In this study, we demonstrate the applicability of the pump-probe, photo-induced lensing (PIL) method to investigate optical electrostriction in various dielectric liquids. Notably, the thermal and nonlinear effects are observed to be temporally decoupled from the electrostriction effects, facilitating isolated observation of the latter. Our findings provide a comprehensive explanation of optical forces in the context of the recently introduced microscopic Ampère electromagnetic formalism, which is grounded in the dipolar approximation of electromagnetic sources within matter and characterizes electrostriction as an electromagnetic-induced stress within the medium. Here, the optical force density is re-obtained through a new Lagrangian approach.
局域光与物质的相互作用会在介电流体中产生光致电致伸缩，进而根据激发光的分布导致介质折射率发生可察觉的变化。这种光力在光学操控中具有至关重要的意义，并在众多光子应用中发挥着基础性作用。在本研究中，我们展示了泵浦 - 探测光致透镜效应（PIL）方法在研究各种介电液体中的光致电致伸缩方面的适用性。值得注意的是，观察到热效应和非线性效应在时间上与电致伸缩效应解耦，这有利于对后者进行单独观察。我们的研究结果在最近引入的微观安培电磁形式体系的背景下，对光力提供了全面的解释，该形式体系基于物质内部电磁源的偶极近似，并将电致伸缩表征为介质内的电磁诱导应力。在此，通过一种新的拉格朗日方法重新获得了光力密度。
