We present a design for a tunneling-current-assisted scanning near-field microwave microscope. For stable operation at cryogenic temperatures, making a small and rigid microwave probe is important. Our coaxial resonator probe has a length of approximately 30 mm and can fit inside the 2-in. bore of a superconducting magnet. The probe design includes an insulating joint, which separates DC and microwave signals without degrading the quality factor. By applying the SMM to the imaging of an electrically inhomogeneous superconductor, we obtain the spatial distribution of the microwave response with a spatial resolution of approximately 200 nm. Furthermore, we present an analysis of our SMM probe based on a simple lumped-element circuit model along with the near-field microwave measurements of silicon wafers having different conductivities.
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June 2016
Research Article|
June 09 2016
Low-temperature-compatible tunneling-current-assisted scanning microwave microscope utilizing a rigid coaxial resonator
Hideyuki Takahashi;
Hideyuki Takahashi
1Organization for Advanced and Integrated Research,
Kobe University
, 1-1, Rokkodai, Nada, Kobe 657-8501, Japan
2Department of Basic Science,
The University of Tokyo
, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Yoshinori Imai;
Yoshinori Imai
2Department of Basic Science,
The University of Tokyo
, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
3Department of Physics,
Tohoku University
, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
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Atsutaka Maeda
Atsutaka Maeda
2Department of Basic Science,
The University of Tokyo
, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Rev. Sci. Instrum. 87, 063706 (2016)
Article history
Received:
March 28 2016
Accepted:
May 23 2016
Citation
Hideyuki Takahashi, Yoshinori Imai, Atsutaka Maeda; Low-temperature-compatible tunneling-current-assisted scanning microwave microscope utilizing a rigid coaxial resonator. Rev. Sci. Instrum. 1 June 2016; 87 (6): 063706. https://doi.org/10.1063/1.4953337
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