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Diagram of the 2D plasmonic Mach-Zehnder interferometer (not drawn to scale). The inset shows an optical image of an actual implementation. 2DEG forms between AlGaAs and GaAs layers.
(a) s 21 magnitude; (b) absolute value of s 21 phase at effective gate bias 0.45 V (red, semi-dashed), 0.55 V (green, dotted), 0.65 V (blue, dashed), and 0.75 V (black, solid). Temperature: 4.2 K. In (b), y-axis is frequency and x-axis is s 21 phase, following the convention of showing dispersion.
The plasmonic velocities extracted from the measured s 21 magnitude (red squares and bars) and those extracted from the measured s 21 phase (blue dots and bars). The squares/dots and bars, respectively, represent the median values and frequency-dependent variations at given biases.
(a) Magnitude and (b) phase of the interferometer's raw s 21 parameters at 4.2 K (black, solid), 20 K (blue, dashed), 40 K (red, semi-dashed), and room temperature (green, dotted), and of the actual open circuits' s 21 parameters at 4.2 K (magenta, thin).
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