Millimeter-wave scanning surface resistance analyzer using a confocal resonator

Dawei Zhang; Jon S. Martens; C. F. Shih; Richard S. Withers; Scott A. Sachtjen; L. P. Suppan; Vincent Kotsubo; Chris P. Tigges

doi:10.1117/12.166156

4 January 1994 Millimeter-wave scanning surface resistance analyzer using a confocal resonator

Dawei Zhang, Jon S. Martens, C. F. Shih, Richard S. Withers, Scott A. Sachtjen, L. P. Suppan, Vincent Kotsubo, Chris P. Tigges

Author Affiliations +

Proceedings Volume 2156, High Tc Microwave Superconductors and Applications; (1994) https://doi.org/10.1117/12.166156
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Millimeter-wave confocal resonators are used in a new, commercially available instrument to map the surface resistance of large area (2 - 4 inch diameter) superconducting thin films. Q-factors are measured from the reflection coefficient of the cavity formed by a spherical aluminum mirror and a planar conductor sitting at half the radius of curvature of the mirror. The surface resistance of the superconducting film is extracted from the measured Q values. Typical R_s values of 20 - 40 m(Omega) are measured for high-quality 2' high-T_c superconducting thin films at 94 GHz and 77 K.

Citation Download Citation

Dawei Zhang, Jon S. Martens, C. F. Shih, Richard S. Withers, Scott A. Sachtjen, L. P. Suppan, Vincent Kotsubo, and Chris P. Tigges "Millimeter-wave scanning surface resistance analyzer using a confocal resonator", Proc. SPIE 2156, High Tc Microwave Superconductors and Applications, (4 January 1994); https://doi.org/10.1117/12.166156

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