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Application of the three-dimensional aperiodic Fourier modal method using arc elements in curvilinear coordinates

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Abstract

This paper deals with a full vectorial generalization of the aperiodic Fourier modal method (AFMM) in cylindrical coordinates. The goal is to predict some key characteristics such as the bending losses of waveguides having an arbitrary distribution of the transverse refractive index. After a description of the method, we compare the results of the cylindrical coordinates AFMM with simulations by the finite-difference time-domain (FDTD) method performed on an S-bend structure made by a 500nm×200nm silicon core (n=3.48) in silica (n=1.44) at a wavelength λ=1550nm, the bending radius varying from 0.5 up to 2 μm. The FDTD and AFMM results show differences comparable to the variations obtained by changing the parameters of the FDTD simulations.

©2012 Optical Society of America

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