Physics – Condensed Matter – Materials Science
Scientific paper
2000-04-26
Rev. Sci. Instrum. vol. 71, 2751-2758 (2000)
Physics
Condensed Matter
Materials Science
12 pages, 10 figures, to be published in Rev. Sci. Instrum., July, 2000
Scientific paper
10.1063/1.1150687
We describe the use of a near-field scanning microwave microscope to image the permittivity and tunability of bulk and thin film dielectric samples on a length scale of about 1 micron. The microscope is sensitive to the linear permittivity, as well as to nonlinear dielectric terms, which can be measured as a function of an applied electric field. We introduce a versatile finite element model for the system, which allows quantitative results to be obtained. We demonstrate use of the microscope at 7.2 GHz with a 370 nm thick barium strontium titanate thin film on a lanthanum aluminate substrate. This technique is nondestructive and has broadband (0.1-50 GHz) capability. The sensitivity of the microscope to changes in relative permittivity is 2 at permittivity = 500, while the nonlinear dielectric tunability sensitivity is 10^-3 cm/kV.
Anlage Steven M.
Canedy C.
Melngailis John
Ramesh Ramamoorthy
Stanishevsky A.
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