Xiaofeng Zhu, M. Harder, A. Wirthmann, Bo Zhang, W. Lu, Y. Gui, Can-Ming Hu
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Near-field microwave phase imaging by a spintronic sensor
We report a novel technique for microwave imaging utilizing a nonlinear coupling between the microwave fields in a ferromagnetic material, in which the relative phase of the coupled microwave fields plays an important role in the resultant homodyne dc voltage. A technical breakthrough has been achieved to effectively control such a relative phase using a spintronic Michelson interferometry. This enables a phase- and amplitude-resolved near-field dielectric image using a spintronic sensor. The contrast of microwave imaging for an object with subwavelength features strongly depends on the local dielectric constant of materials, and agrees well with simulation results by COMSOL.