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arXiv 1702.01581physics.optics
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层状介质中增强的声光特性

Enhanced acousto-optic properties in layered media

M. J. A. Smith, C. Wolff, M. Lapine, C. G. Poulton, C. Martijn de Sterke

摘要:

我们提出了一个严格的程序来评估的光弹性系数的层状介质的周期性小于所有的光场和声场的波长。给出了由光学各向同性材料薄层组成的复合材料的系数的解析表达式。这些系数包括结构化介质所特有的人工贡献,这些贡献来自组分之间的光学和机械对比。使用数值例子,我们表明,分层结构的声光性能可以增强超出那些组成材料。此外,我们表明,声光响应可以根据需要进行调谐。

英文摘要:

We present a rigorous procedure for evaluating the photoelastic coefficients of a layered medium where the periodicity is smaller than the wavelengths of all optical and acoustic fields. Analytical expressions are given for the coefficients of a composite material comprising thin layers of optically isotropic materials. These coefficients include artificial contributions that are unique to structured media and arise from the optical and mechanical contrast between the constituents. Using numerical examples, we demonstrate that the acousto-optic properties of layered structures can be enhanced beyond those of the constituent materials. Furthermore, we show that the acousto-optic response can be tuned as desired.

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