Strategies for precision adhesive bonding of optical micro-components
P. de Potter (TU Delft - Mechanical Engineering)
M Tichem – Mentor (TU Delft - Micro and Nano Engineering)
M.K. Ghatkesar – Graduation committee member (TU Delft - Micro and Nano Engineering)
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Abstract
This study establishes an adhesive bonding strategy for the micro-assembly of optical components using UV-curable adhesives. The focus is on factors influencing adhesive shrinkage and alignment accuracy. Key findings reveal that higher UV intensity reduces both volumetric and linear shrinkage, while curing from below the substrate minimizes horizontal shifts on the to-be bonded optical components, eliminating the need for horizontal offset adjustments. The study highlights how variations in the distance between the substrate and component affect vertical shrinkage displacements and stresses the importance of precise adhesive volume control to enhance accurate shrinkage prediction. The developed shrinkage prediction model forecasts sub-micrometer accurate vertical component shrinkage compensations, validated through comprehensive parameter testing. To advance research toward more accurate shrinkage predictions and a deeper understanding of adhesive shrinkage behavior, future studies propose integrating multi-angle observation systems and expanding parameter testing. These efforts aim to refine prediction models and validate strategies in real-world applications, thereby enhancing the reliability and precision of optical systems across industrial and scientific domains.