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碳纳米颗粒悬浮液作为一种宽带光限幅材料,在光限幅领域有很好的应用前景。为提高碳纳米颗粒悬浮液的光限幅性能,研究了其光限幅机理。基于等效球的米氏散射理论和介质的激光传输理论,在忽略多重散射情况下建立了碳纳米颗粒悬浮液散射系数和透过率理论模型。采用Matlab数值模拟了微气泡膨胀过程中微气泡的散射、消光和吸收效率因子的变化情况和散射光强随着散射角的变化规律,并研究了微气泡尺寸和悬浮液浓度对碳纳米颗粒悬浮液光散射的影响,样品厚度和悬浮液浓度对光限幅特性的影响。研究发现微气泡尺寸的增加可以显著增大散射系数,微气泡尺寸是影响碳纳米颗粒悬浮液光限幅性能的关键因素,研究结果为实验研究提供了理论指导。
As a kind of broadband optical limiting material, carbon nanoparticle suspension has a good application prospect in the field of optical limiting. In order to improve the optical limiting properties of carbon nano-particles suspension, the optical limiting mechanism was studied. Based on the Mie scattering theory of the equivalent sphere and the laser transmission theory of the medium, a theoretical model of the scattering coefficient and the transmittance of the carbon nano-particle suspension is established without considering the multiple scattering. The changes of the scattering, extinction and absorption efficiency factors and scattering light intensity with the scattering angle of microbubbles in the process of the expansion of microbubbles were numerically simulated by Matlab, and the effects of the size of the microbubbles and the suspension concentration on the carbon nanoparticles suspension The influence of light scattering, the thickness of the sample and the concentration of the suspension on the optical limiting properties. It was found that the increase of the size of the microbubbles can significantly increase the scattering coefficient. The size of the microbubbles is a key factor that affects the optical limiting properties of the carbon nano-particles suspension. The results provide theoretical guidance for the experimental study.