Terahertz frequency spectrum analysis with a nanoscale antiferromagnetic tunnel junction
Technical Report,01 Jan 2019,25 Sep 2019
US ARMY CCDC GVSC WARREN
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A method to perform spectrum analysis on low power signals between 0.1 and 10 THz is proposed. It proposes to use a nanoscale antiferromagnetic tunnel junction ATJ that produces an oscillating tunneling anisotropic magnetoresistance whose frequency is dependent on the magnitude of an evanescent spin current. It is first shown that the ATJ oscillation frequency can be tuned linearly with time. Then, it is show that the ATJ output is highly depended matching conditions, which are intern highly dependent on the dimensions of the dielectric tunneling barrier. Spectrum analysis can be performed by using an appropriately designed ATJ whose frequency is driven to increase linearly with time, a low pass filter, and a matched filter. This method of THz spectrum analysis, if realized in experiment, will allow miniaturized electronics to rapidly analyze low power signals with a simple algorithm. We found by simulation and analytical theory that for an ATJ with a036 m2 footprint, spectrum analysis can be performed over a 0.25 THz bandwidth in just 25 ns on signals that are at the Johnson-Nyquist Thermal Noise floor.
- Atomic and Molecular Physics and Spectroscopy