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Effect of Numerical Dispersion in FDTD Simulations of Light Scattering from Photoreceptors

机译:数值色散对FDTD模拟感光器光散射的影响

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摘要

Recently, the FDTD method was used to investigate the optical functional response of retinal photoreceptors. Light scattering patterns of the cells were simulated under various hypothetical states to determine the physiological processes that are most likely responsible for the experimentally observed signals. An FDTD model of a photoreceptor cell spans several wavelengths, therefore, the numerical dispersion, inherent in FDTD algorithms, will introduce significant phase errors in the simulation results. These phase errors can lead to erroneous predictions, especially for narrow band light stimulus. Currently, the qualitative and quantitive effects of numerical dispersion on light scattering computations are still unknown. In this paper, an analysis of the numerical dispersion errors in the near and far scattered fields is performed. The analysis provides decision guidelines for selecting enough computational resources to obtain the light scattering patterns with acceptable margin of errors.
机译:最近,FDTD方法用于研究视网膜感光器的光学功能反应。在各种假设状态下模拟细胞的光散射模式,以确定最有可能导致实验观察到的信号的生理过程。感光细胞的FDTD模型跨越多个波长,因此,FDTD算法固有的数值色散将在仿真结果中引入明显的相位误差。这些相位误差会导致错误的预测,尤其是对于窄带光刺激而言。目前,数值色散对光散射计算的定性和定量影响仍然未知。本文对近,远散射场中的数值色散误差进行了分析。该分析提供了用于选择足够的计算资源来获得具有可接受误差范围的光散射图案的决策准则。

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