Eigenmode Analysis of a LightGuiding Metal Line Loaded on a Dielectric Substrate Using the ImaginaryDistance BeamPropagation Method
Journal of Lightwave Technology, Vol. 23, Issue 3, pp. 1533 (2005)
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Abstract
Fundamental characteristics of a lightguiding metal line are revealed and discussed through the eigenmode analysis using the threedimensional (3D) imaginarydistance beampropagation method (IDBPM) based on the alternatingdirection implicit scheme. For the present IDBPM, the multiplication factor of the eigenmode is derived and the paper described how the present method works in the ID procedure. An efficient absorbing boundary condition is described,which is suitable for the eigenmode analysis using the IDBPM. After confirming the effectiveness of the present method, the characteristics of the lightguiding line composed of a metal (Au) with a finite width and thickness on a substrate (SiO2) are investigated. Numerical results for a metal thickness of 0.2 µm show that the effective index and the propagation loss decrease as the metal width is reduced. It is shown that not only the higher order modes but also the first mode has a cutoff metal width. Near the cutoff width, the propagation loss of the first mode (~ or = 10 dB/mm at a wavelength of 1.55 µm) is less than those of the higher order modes. Finally, in order to reduce the propagation loss, a dielectric core was added under the metal line.
© 2005 IEEE
Citation
Jun Shibayama, Tomohide Yamazaki, Junji Yamauchi, and Hisamatsu Nakano, "Eigenmode Analysis of a LightGuiding Metal Line Loaded on a Dielectric Substrate Using the ImaginaryDistance BeamPropagation Method," J. Lightwave Technol. 23, 1533 (2005)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt2331533
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