Title :
Finite element solution of electron waveguide discontinuities and its application to quantum field effect directional couplers
Author :
Gotoh, Hitoshi ; Koshiba, Masanori ; Kaji, Ryosaku
Author_Institution :
Hakodate Tech. Coll., Japan
fDate :
10/1/1996 12:00:00 AM
Abstract :
A numerical approach based on the finite element method is described for the solution of electron waveguide discontinuities with arbitrary potential and effective-mass distributions. Analytical solutions are introduced for the uniform waveguide regions. The approach is applied to a quantum field effect directional coupler with finite coupling length and longitudinal discontinuities. The effects of the longitudinal interference due to the discontinuities and of the transverse interference due to the even and odd supermodes in the coupling region are studied. The influence of the shape of the wire-tip on the transmission properties is also investigated
Keywords :
effective mass; electron waveguides; finite element analysis; optical couplers; optical directional couplers; quantum field theory; quantum interference devices; waveguide discontinuities; arbitrary potential; coupling region; effective-mass distributions; electron waveguide discontinuities; even supermodes; finite coupling length; finite element solution; longitudinal discontinuities; longitudinal interference; odd supermodes; quantum field effect directional coupler; quantum field effect directional couplers; transmission properties; transverse interference; uniform waveguide regions; wire-tip; Couplings; Electrons; Equations; Finite element methods; Geometry; Interference; Potential energy; Propagation constant; Shape; Waveguide discontinuities;
Journal_Title :
Quantum Electronics, IEEE Journal of
