Numerous applications of terahertz communication and sensing technology require powerful electronic sources and sensitive detectors. Recently proposed “plasmonic boom” terahertz devices require the electron velocity repeatedly cross the plasma velocity in periodic electronic structures. Such devices could increase the generated power and detection sensitivity by orders of magnitude. However, they require tuning boundary conditions at heterodimensional interfaces and decreasing the velocity of the plasmons. We propose using the protruding side regions attached to a plasmonic channel – “plasmonic stubs” – to control the boundary conditions and slow down plasmons in a controllable and tunable fashion. Using the transmission line modeling approach, we derive the expression for the input impedance of the device with a stub and show the input impedance could be tuned from minus to plus infinity. We derive and solve the dispersion equation for the plasmons and show the tunable plasma velocity decrease. These results are important for design, characterization, modeling, and parameter extraction of the next generation of THz electronic devices and circuits.
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