Yaqiang Wang, C. A. Paulson, Guoqing Ning, D. W. van der Weide
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Fabrication and measurements using ultra-tall near-field coaxial tips
We present a new method for microfabrication of coaxial silicon tips with heights >50 /spl mu/m. The coaxial silicon tip acts as an electrically small antenna. Microwave measurements using a microfabricated coaxial tip chip are performed with a network analyzer HP8753D and an atomic force microscope (AFM). Scanning near-field microwave microscopy (SNMM) using the ultra-tall coaxial tip is demonstrated with a commercial AFM silicon probe in noncontact mode as a sample.