Abstract
AbstractA numerical approach based on the finite element method using tetrahedral elements is proposed for the three‐dimensional discontinuity in electron waveguides. A three‐dimensional finite element method is applied for a region containing a discontinuity with an arbitrary shape. The uniform waveguide region connected to the discontinuity is treated analytically. The reflection probability and transmission probability are calculated, in addition to the current density, by combining the finite element method and the analytical solution. The transmission characteristics of a rectangular cavity between two electron waveguides are examined. It is found that the transmission probability of the three‐dimensional structure is much different from that of the two‐dimensional one.
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