We demonstrate the use of 3D direct laser writing method to fabricate large-scale 3D metasurfaces with unleashed height degree of freedom. We showcased multiple 3D laser-nanoprinted metasurfaces for a range of photonic applications, including ultrahigh-bandwidth holography, metafibre-enabled optical trapping, highly sensitive molecular sensing, achromatic fibre-optic focusing and imaging, and structured light generation on metafibres. The optical performance of our demonstrated 3D laser-nanoprinted metasurfaces surpass existing 2D metasurfaces fabricated from planar lithography. This metasurface fabrication platform allows superior integration with other photonic elements, such as optical fibres, holding great potential for advanced classical and quantum light manipulation.
In this presentation, a new concept of an achromatic metafiber that focuses light coming out from the fiber facet over wavelengths of interest will be introduced. The achromatic metafiber consists of achromatic metalens microprinted on a telecommunication single-mode fiber. The 3D meta-atoms of which height is a geometric degree of freedom provide large variation of group delay, capable of realizing large time-bandwidth product. As a demonstration, direct scanning confocal imaging using the metafiber is facilitated over entire telecommunication wavelengths. Our compact achromatic metafiber may envisage many photonics applications such as hyperspectral imaging, in vivo deep-tissue imaging, and wavelength-multiplexed fiber communications.
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