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| Look sharp: Principle of an achromatic metafiber used for achromatic focusing and imaging. An achromatic metalens located on top of a 3D-printed hollow tower (used for fiber-beam expansion) was interfaced with a single-mode fiber via 3D laser nanoprinting. Inset: an enlarged 3D nanopillar meta-atom (height: H, length: L, width: W), the height of which offers a large modulation range of group delay. Credit: Nature Communications (2022). |
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