Maxwell方程式を用いた光伝播解析手法の精度の検討(流体工学,流体機械)

概要

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Recently, many diagnosis devices utilizing light scattered by biological tissue or a cell have been developed. Then understanding of characteristics about light propagation and light scattering in biological tissue plays an important role. In this report, we focus on FDTD method, CIP method and IDO method as an numerical method about light propagation in time domain and those methods are applied to Maxwell's equations. The propagation of Gaussian pulse is calculated by those methods in uniform medium and Fourier transform is applied to the resultant waveform to investigate accuracy of those methods. It is found that FDTD method excels at calculating amplitude in frequency domain and CIP method can analyze phase of waveform with high accuracy, and IDO method has highest accuracy among those methods in time domain when small grid size is used. Finally, in the case that an infinitely long cylinder is existed in analytical area, scattering light is calculated. The results show that IDO method could have a problem depending on relation between physical value and the spacial derivation value on the boundary between materials.
2010-08-25