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Ballistic spin transport through waveguides, with symmetric or asymmetricdouble stubs attached to them periodically, is studied systematically in thepresence of a weak spin-orbit coupling that makes the electrons precess. By anappropriate choice of the waveguide length and of the stub parameters injectedspin-polarized electrons can be blocked completely and the transmission shows aperiodic and nearly square-type behavior, with values 1 and 0, with wide gapswhen only one mode is allowed to propagate in the waveguide. A similar behavioris possible for a certain range of the stub parameters even when two-modes canpropagate in the waveguide and the conductance is doubled. Such a structure isa good candidate for establishing a realistic spin transistor. A furthermodulation of the spin current can be achieved by inserting defects in afinite-number stub superlattice. Finite-temperature effects on the spinconductance are also considered.Comment: 19 pages, 8 figure

Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides