Fast and high-yield fabrication of axially symmetric ion-trap needle electrodes via two step electrochemical etching

• URL: http://arxiv.org/abs/2206.14784v1
• Date: Wed, 29 Jun 2022 17:37:39 GMT
• Title: Fast and high-yield fabrication of axially symmetric ion-trap needle electrodes via two step electrochemical etching
• Abstract summary: We demonstrate an etching technique for quick fabrication of straight and symmetric needles with a high success rate. The needles fabricated via this technique have been used in our ion-trap to achieve trapping lifetimes of several months.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Despite the progress in building sophisticated microfabricated ion traps, Paul traps employing needle electrodes retain their significance due to the simplicity of fabrication while producing high-quality systems suitable for quantum information processing, atomic clocks etc. For low noise operations such as minimizing `excess micromotion', needles should be geometrically straight and aligned precisely with respect to each other. Self-terminated electrochemical etching, previously employed for fabricating ion trap needle electrodes employs a sensitive and time-consuming technique resulting in a low success rate of usable electrodes. Here we demonstrate an etching technique for quick fabrication of straight and symmetric needles with a high success rate and a simple apparatus with reduced sensitivity to alignment imperfections. The novelty of our technique comes from using a two-step approach employing turbulent etching for fast shaping and slow etching/polishing for subsequent surface finish and tip cleaning. Using this technique, needle electrodes for an ion-trap can be fabricated within a day, significantly reducing the setup time for a new apparatus. The needles fabricated via this technique have been used in our ion-trap to achieve trapping lifetimes of several months.

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