| Affiliation: | (1) Department of Physics, Blk S12, Faculty of Science, National University of Singapore, 2 Science Drive 3, 117542, Singapore;(2) Centre for Ion Beam Applications, Department of Physics, National University of Singapore, 2 Science Drive 3, Blk S12, 117542, Singapore;(3) Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore;(4) Division of Bioengineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore |
| 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. PACS 07.60.Pb; 41.75.Ak; 42.15.Eq; 42.65.Jx; 42.79.Bh |
