Separation of Raji cells from RBCs with a concentration ratio of 1:10. (a) Initially, when the optical patterns were projected onto the a-Si:H surface without externally applied voltage, both of Raji cells and RBCs were suspended in the liquid solution; (b) when the voltage was switched on, the two types of cells were repelled; (c) the 25 μm-wide optical line was set with a translational velocity of 12 μm/s from left to right and the 15 μm-optical line was kept static. After 15-s movement of 25 μm-wide optical line, the two types of cells were aligned between the gap of the two lines; (d) the Raji cells were separated from RBCs. Reproduced with permission from Liang et al., PloS One 9, e90827 (2014). Copyright 2014 PLoS Publishing.