Figure 7
From: Manipulating and assembling metallic beads with Optoelectronic Tweezers

Gradient of the electric field squared in the liquid just above the a-Si:H for the three simulation runs.
OET device without a metallic microsphere (red line), OET device with a metallic microsphere at the left edge of the trap but without the shadow effect (black line), and OET device with a metallic microsphere at the left edge of the trap and with the shadow effect (blue line).