Metalens microscope switches focus with voltage, not moving optics

Just as it is difficult for a camera to keep both a nearby flower and a distant mountain sharply focused at the same time, conventional optical microscopes face a similar challenge when imaging structures located at different depths inside the body. Tighter focusing of light improves spatial resolution, but at the same time reduces the depth range over which the image remains sharply focused.

Read it at Phys.org ↗

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