研究目的
To investigate features of stimulated low-frequency scattering (SLFS) in an aqueous suspension of dielectric nanospheres with different ratios of their size to the wavelength of the exciting single mode laser radiation.
研究成果
Excitation of coherent vibrations of polystyrene nanospheres with different diameters at their acoustic eigenmodes in aqueous suspensions has been observed in the laser pulse field. The developed model of interaction of an electromagnetic field with a dielectric in heterogeneous media allows calculation of acoustic eigenmodes of nanospheres in a suspension, with estimations in satisfactory agreement with the experimental data.
研究不足
The technical and application constraints include the damping of the symmetric mode by acoustic radiation into the liquid due to equality of densities and closeness of acoustic impedances. Potential areas for optimization involve further theoretical and experimental investigations to understand the coupling mechanisms between counterrunning Stokes waves at high concentrations of nanospheres.
1：Experimental Design and Method Selection:
The experiment involved the excitation of coherent vibrations of polystyrene nanospheres in aqueous suspensions using laser pulses. A model of interaction of an electromagnetic field with a dielectric in heterogeneous media was developed to calculate eigenmodes of nanospheres in a suspension.
2：Sample Selection and Data Sources:
Aqueous suspensions of calibrated polystyrene spheres with average diameters of about 74, 292, and 540 nm were investigated. Three sets of suspensions with varying concentrations were prepared.
3：List of Experimental Equipment and Materials:
Quartz cells with a working length of about 20 mm, a lens with a 30 mm focal length for focusing laser radiation into the cell.
4：Experimental Procedures and Operational Workflow:
The suspensions were placed in quartz cells and exposed to laser pulses with energy increased from about 1 to 40 mJ. Measurements were performed at room temperature.
5：Data Analysis Methods:
The observed features were substantiated by developing a model that allows calculation of acoustic eigenmodes of nanospheres in a suspension.
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