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Characteristics of Evanescent Waves in the Nonstandard FDTD Method

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4 Author(s)
Taguchi, K. ; Kumamoto Nat. Coll. of Technol., Koshi ; Ohtani, T. ; Kashiwa, T. ; Kanai, Y.

This paper investigates the characteristics of evanescent waves in the generalized nonstandard finite-difference time-domain (NS-FDTD) method and derives the dispersion equation and stability condition for two-dimensional space. The validity of the dispersion equation is confirmed by comparison with results of numerical simulations. The NS-FDTD method is applied to the analysis of an optical switching device using a photon tunneling effect. It is shown that the NS-FDTD method has highly accurate characteristics not only for propagating waves, but also for evanescent waves compared with the standard FDTD method

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 4 )