Accuracy Assessment of FDTD Method for the Analysis of Sub-Wavelength Photonic Structures


IEICE TRANSACTIONS on Electronics   Vol.E99-C    No.7    pp.780-787
Publication Date: 2016/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.780
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Simulation Techniques and Their Applications for Electronics)
FDTD method,  GPGPU,  computational accuracy,  sub-wavelength periodic structure,  

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FDTD (Finite-Difference Time-Domain) method has been widely used for the analysis of photonic devices consisting of sub-wavelength structures. In recent years, increasing efforts have been made to implement the FDTD on GPGPUs (General-Purpose Graphic Processing Units), to shorten simulation time. On the other hand, it is widely recognized that most of the middle- and low-end GPGPUs have difference of computational performance, between single-precision and double-precision type arithmetics. Therefore the type selection of single/double precision for electromagnetic field variables in FDTD becomes a key issue from the viewpoint of the total simulation performance. In this study we investigated the difference of results between the use of single-precision and double-precision. As a most fundamental sub-wavelength photonic structure, we focused on an alternating multilayer (one dimensional periodic structure). Obtained results indicate that significant difference appears for the amplitudes of higher order spatial harmonic waves.