Phenanthrenequinone doped poly(methyl methacrylate) is a well-known holographic polymer used in many applications. It is important to consider the refractive index modulation (Δn) when designing a phase grating, as it heavily influences the diffraction efficiency. However, due to the behavior of the electric susceptibility in this material, the Δn will be different at varying reconstructed wavelengths. Here, we report on the observation of the difference in this modulation for various wavelengths. We develop a model for a two-level approximation of the electric susceptibility, based on the absorption spectrum of the material, to estimate the read wavelength dependence of the modulation for a given sample, and find our results to be in good agreement with this model.

中文翻译：

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通过电化率的两级近似确定 PQ:PMMA 全息相位光栅在大光谱范围内的折射率调制

菲醌掺杂的聚（甲基丙烯酸甲酯）是一种众所周知的全息聚合物，用于许多应用。在设计相位光栅时考虑折射率调制 (Δ n )很重要，因为它会严重影响衍射效率。然而，由于这种材料的电敏感性行为，Δn在不同的重构波长下会有所不同。在这里，我们报告了对各种波长的这种调制差异的观察。我们开发了一个基于材料吸收光谱的电敏感性两级近似模型，以估计给定样品调制的读取波长依赖性，并发现我们的结果与该模型非常吻合.