碳纳米颗粒悬浮液光限幅性能理论分析和数值模拟  

Theoretical analysis and numerical simulation of optical limiting performance in suspension of carbon nanoparticles

作　　者：王彩丽[1] 牛燕雄[1] 崔云霞[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《红外与激光工程》2012年第5期1186-1190,共5页Infrared and Laser Engineering

摘　　要：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。Suspension of carbon nanoparticles is an excellent broad band optical limiting material which is widely used in the field of optical limiting. In order to improve optical limiting performance in suspension of carbon nanoparticles, it is very important to study mechanism of the optical limiting. Based on Mie scattering theory and radiation transmission through the medium, theory model of scattering rate and transmittance in suspended carbon nanoparticles were established. Extinction efficiency factor, scattering efficiency factor, absorption efficiency factor have been numerical calculated as a function of the micro- bubble size, and intensity of the scattered light have been numerical calculated as a function of the scattering angle by Matlab. The effect of the micro-bubble size and suspension concentration on the scattered light intensity were studied. The effect of sample thickness and the suspension concentration on the optical limiting characteristics were also studied.

关 键 词：碳纳米颗粒悬浮液 米氏散射 光限幅性能 

分 类 号：O436.2[机械工程—光学工程]