光在嵌有聚苯乙烯微球的干凝胶基质中的可控传输平均自由程
Controllable transport mean free path of light in xerogel matrixes embedded with polystyrene spheres
摘要：
通过溶胶-凝胶技术制成的干凝胶基质嵌入聚苯乙烯球以促进光的多次光的散射。改变基质内球体的浓度允许调节材料内光的传输平均自由路径。相干后向散射测量表明，从90至600 nm的范围内的运输平均自由程是很容易实现的。矩阵折射率的测定允许直接比较多次散射和米氏理论。这种可调扩散溶胶-凝胶衍生的样品可以进一步优化为随机激光材料。
英文摘要：
Xerogel matrices, made by sol-gel techniques, are embedded with polystyrene spheres to promote multiple scattering of light. Varying the concentration of the spheres inside the matrix allows one to adjust the transport mean free path of light inside the material. Coherent backscattering measurements show that a range of transport mean free paths from 90 to 600 nm is easily achieved. The determination of the matrix refractive index permits a direct comparison to multiple scattering and Mie theory. Such tunable diffusive sol-gel derived samples can be further optimized as random laser materials.
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