Analysis of Plasmonic Waveguides and Gratings Using Implicit Finite-Difference Methods

概要

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Various metal-insulator-metal- (MIM-) type plasmonic waveguides and gratings are investigated numerically. Three gratings aretreated: one is formed by alternately stacking two kinds of MIM waveguides, another by periodic changes in the dielectric insulatormaterials of an MIM waveguide, and the other by a periodic variation of the air core width in an MIM waveguide. The dispersionproperty of each MIM waveguide of which the grating consists is analyzed using the implicit Yee-mesh-based beam-propagationmethod. It is shown that the third one has a relatively large effective index modulation of the guided mode with a simple gratingstructure, while maintaining a low propagation loss. Further examination is given to modifications of this grating structure. Thetransmission characteristics are examined using the frequency-dependent implicit locally one-dimensional FDTD method. Wediscuss how the modified grating structure affects the bandgap of the transmission characteristics.
2011-07-30