Large-angular separation of particles induced by cascaded deflection angles in optical sorting

Yuan, X.-C.; Zhu, S. W.; Bu, J.; Sun, Y. Y.; Lin, J.; Gao, Bruce Z.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p263901
Academic Journal
A composite microlens array (MLA) with two cascaded guiding axes has been fabricated to achieve a large lateral separation of an object with different refractive indices or sizes. The MLA projects a composite pattern formed by its focal spots into a microchamber for optical sorting in a microscopic system. This approach enables passive, high power, efficient, and continuous microfluidic sorting without requiring complicated optical assembly. Separation of particles with different refractive indices to a lateral angle of 40° is experimentally demonstrated with moderate laser power.


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