Enhancement of the computational efficiency of the near-to-far field mapping in the finite-difference method and ray-by-ray method with the fast multi-pole plane wave expansion approach
| Autor: | R. Lee Panetta, George W. Kattawar, Bingqiang Sun, Guanglin Tang, Ping Yang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Radiation 010504 meteorology & atmospheric sciences Geometrical optics business.industry Computation Finite difference method Phase (waves) Finite-difference time-domain method Near and far field Physical optics 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics 0103 physical sciences Plane wave expansion business Spectroscopy 0105 earth and related environmental sciences |
| Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer. 176:70-81 |
| ISSN: | 0022-4073 |
| DOI: | 10.1016/j.jqsrt.2016.02.027 |
| Popis: | The finite-difference time-domain (FDTD) and ray-by-ray (RBR) methods are techniques used to calculate the optical properties of nonspherical particles for small-to-moderate and large size parameters, respectively. The former is a rigorous method, and the latter is an approximate geometric–physical optics-hybrid method that takes advantage of both high efficiency of the geometric optics approach and high accuracy of the physical optics approach. In these two methods, the far field is calculated by mapping the near field to the far field with consideration of the phase interference. The mapping computation is more time-consuming than the near-field simulation when multiple scattering directions are involved, particularly in the case of the RBR implementation. To overcome the difficulty, in this study the fast multi-pole method is applied to both FDTD and RBR towards accelerating the far-field calculation, without degrading the accuracy of the simulation results. |
| Databáze: | OpenAIRE |
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