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Volume 655 Issue 8121, 2 July 2026

Getting a grip

Manipulating micrometre-sized matter is not easy. Optical tweezers, which use tightly focused light beams to move matter, are extremely precise but limited by the very light forces they can apply. Mechanical tweezers, which rely on more conventional means to grip and move things, can exert greater force but lack the precision offered by light. In this week’s issue, Dong Wu and colleagues reveal a 3D gripper that combines the best of both worlds. The researchers created a mechanical microclaw just 38 micrometres wide that is controlled by light. An optical fibre delivers laser light to a heat-sensitive hydrogel connected to a rigid polymer claw. Switching on the laser light heats silver nanoparticles embedded in the hydrogel, which causes the hydrogel to contract and opens the microclaw. In this way the researchers were able to use their 3D ‘optical fibre gripper’ to manipulate individual cells (pictured on the cover) and irregular microobjects as well to help assemble microdevices and to take samples in confined spaces.

Cover image: Dong Wu

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