Nature research paper: Electronic metadevices for terahertz applications
, imaginary parts of the current density at the barrier in the OFF state. The imaginary part of the input current is dominant in the OFF state, which makes the device impedance mostly reactive., Micrograph of a fabricated three-terminal metadevice. One terminal is pumped with a radiofrequency signal and the state of the device is controlled by the gate terminal.
The input port of the devices were excited by a current source , and the real part ofis plotted. The absolute value of the input current was selected to result in a current density of ~1 A mm, Simulated current density at the semiconductor channel at different frequencies from 200 GHz to 1.6 THz. At 200 GHz, there is almost no interaction between the subwavelength mode and the stripe array, and therefore, current density is not confined.
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