Near-field microwave phase imaging by a spintronic sensor

XiaoFeng Zhu; M. Harder; A. Wirthmann; Bo Zhang; W. Lu; Y. S. Gui; C.-M. Hu

doi:10.1117/12.888266

18 February 2011 Near-field microwave phase imaging by a spintronic sensor

XiaoFeng Zhu, M. Harder, A. Wirthmann, Bo Zhang, W. Lu, Y. S. Gui, C.-M. Hu

Proceedings Volume 7995, Seventh International Conference on Thin Film Physics and Applications; 79951X (2011) https://doi.org/10.1117/12.888266
Event: Seventh International Conference on Thin Film Physics and Applications, 2010, Shanghai, China

Abstract

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.

Citation Download Citation

XiaoFeng Zhu, M. Harder, A. Wirthmann, Bo Zhang, W. Lu, Y. S. Gui, and C.-M. Hu "Near-field microwave phase imaging by a spintronic sensor", Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 79951X (18 February 2011); https://doi.org/10.1117/12.888266

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