New “metalens” shifts focus without tilting or moving

MIT researchers fabricated a new lens that shifts focus without physically tilting or shifting. The design may improve on existing zoom lenses.

Rather than relying on a material’s fixed curvature to direct light, the researchers looked to modify GSST-based metalens in a way that the focal length changes with the material’s phase.

In their new study, they fabricated a 1-micron-thick layer of GSST and created a “metasurface” by etching the GSST layer into microscopic structures of various shapes that refract light in different ways.

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