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We describe a complete development process of a segmented-blade linear iontrap. Alumina substrate is characterized with an X-ray diffraction andloss-tangent measurement. The blade is laser-micromachined and polished,followed by the sputtering and gold electroplating. Surface roughness isexamined at each step of the fabrication via both electron and opticalmicroscopies. On the gold-plated facet, we obtain a height deviation of tens ofnanometers in the vicinity of the ion position. Trapping of laser-cooled$^{174}$Yb$^{+}$ ions is demonstrated.

Ion trap with gold-plated alumina: substrate and surface characterization