Optical micromanipulation allows the movement and patterning of discrete micro-particles within a liquid environment. However for manufacturing applications, it is desirable to remove the liquid leaving the patterned particles in place. In this work, we have demonstrated the use of optoelectronic tweezers (OET) to manipulate and accurately assemble Sn₆₂Pb₃₆Ag₂ solder microspheres into tailored patterns. A technique based on freeze-drying technology was then developed, which allows the assembled patterns to be well preserved and fixed in place after the liquid medium in the OET device is removed. After removing the liquid from the OET device and subsequently heating the assembled pattern, melting the solder microspheres, electrical connections between the microspheres were formed creating a permanent conductive bridge between two isolated metal electrodes. Although this method is demonstrated with 40 μm diameter solder beads arranged with OET it could be applied to a great range of discrete components from nanowires to optoelectronic devices thus overcoming one of the basic hurdles in using optical micromanipulation techniques in a manufacturing micro-assembly setting.
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Date made available | 14 Jun 2023 |
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Publisher | figshare |
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Date of data production | 2017 |
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