Transport and separation of microspheres with lensless imaging

摘要

Authors propose an on-chip solution for continuous transport and separation of microspheres based on a lensless imaging technique, Talbot effect. High contrast intensity pattern of optical lattice is created at Talbot distance within the microfluidic chamber. The advantages of this proposed method include large-scale, power-efficient, compact, simple configuration etc. The binary two-dimensional chessboard grating was designed and fabricated. Experimentally regular array of microspheres were trapped with static optical lattice, while the translation of group of spheres were demonstrated with dynamic optical lattice. And continuous separation of microspheres with different sizes was realized. Finally, the experimental result of passive guiding of a group of spheres on a tilted asymmetric optical landscape was introduced.