Abstract
We report two different applications for using arrays of microlenses on glass substrate to facilitate multiple-spot optical trapping of colloidal microbeads. The array of microlenses was made of SU8 or PMMA resist and created by a combination of Proton-Beam writing followed by thermal reflow processes. Firstly, similar to previous reports [8, 9, 10 ], the lenses were utilized as an optical element in generating multiple laser spot arrays that were subsequently focused down to impose a microbead array. In addition, we demonstrated the feasibility of a novel approach of integrating the microlens array into a sample chamber to provide localized optical trapping.
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Video clips of the colloidal assembly using the multiple-spots laser tweezing, rotation of colloidal spheres array and on-board multiple spots optical tweezers trapping can be found from the following website http://www.physics.nus.edu.sg/∼physowch/multi_optw/multi_optw.html
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07.60.Pb; 41.75.Ak; 42.15.Eq; 42.65.Jx; 42.79.Bh
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Sow, C., Bettiol, A., Lee, Y. et al. Multiple-spot optical tweezers created with microlens arrays fabricated by proton beam writing. Appl. Phys. B 78, 705–709 (2004). https://doi.org/10.1007/s00340-004-1425-6
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DOI: https://doi.org/10.1007/s00340-004-1425-6