We have developed a near-field scanned microwave probe with a sampling volume of approximately 10 mu m in diameter, which is the smallest one achieved in near-field microwave microscopy. This volume is defined to confine > 99% of the probe's net sampling reactive energy, thus making the response virtually independent of the sample properties outside of this region. The probe is formed by a 4 GHz balanced stripline resonator tapered down to a few-micrometer tip size and provides noncontact, noninvasive measurement capability. It is uniquely suited for spatially localized electrical metrology applications, such as evaluation of Cu/low-k interconnects on semiconductor production wafers. (c) 2006 American Institute of Physics.
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