Optical tweezers are widely used for manipulating microscopic objects. Compared to other contact type microscopic
manipulators such as micro-grippers that exhibit firm gripping, optical tweezers inherently possess loose gripping. For
example, if a user tries to move target objects too fast such that the drag force of the viscous fluid exceeds the trapping
force, target objects will escape from the effective trapping region. When this happens in a standard user interface
environment with only video feedback, the user would sense this with a visual cue and slow down or slightly reverse the
movement of the trap. In this study we enrich the user interface by adding a haptic cue that is a sense of forces and
torques so that the user will sense the drag force and torque that is proportional to the gap distance and angle between the
line trap and the nanowire. We present some preliminary results of putting haptic cue for manipulating nanowires.
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