Figure 1. Demonstration of material variety via 12 Chinesezodiac animals, including fluorescent image of two dragons of CdSe quantum dots (QDs) without shrinking (the inset shows a resolution of ~200 nm); SEM (top) and EDX (bottom) images of a monkey of Ag; pig of Au-Ag alloy; snake of TiO2; dog of Fe3O4; rabbit of NaYREF4; optical microscopy image of an ox of diamond; fluorescent images of a tiger of graphene QDs; goat of fluorescent Au; horse of polystyrene; rooster of fluorescein; and mouse of fluorescent protein.
Figure 2. Nanostructures demonstrating minimum feature sizes. (A) 3D model of a nonconnected “NANO” structure comprised of arrays of parallel nanowires. (B) SEM cross-sectional images of the “NANO” structure cut by focused ion beam (FIB); (C) zoom-in view of the letter “A” in (B); and (D) zoom-in view (C). (E) Four cross-sectional patterns of the “NANO” structure (in the x-z plane of (A)). (F) SEM images showing the trenches of the gel sample opened by the FIB-cut, where the positions of each letter are labelled. All cross-sectional images were taken at a substrate tilt angle of 52°.
Figure 3. Fabrication of large-scale woodpile structures: (A) 12-layer woodpile structure of florescent polystyrene (top view, stitched from 16 sub-images due to the limited microscope field of view.); (B) zoom-in view of (A), where the inset shows a 3D fluorescent image of the structural details in the selected area; (C) cuboid woodpile structure of fluorescent protein; (D) O-shaped 3D woodpile structure of CdSe.
Figure 4. Printing of complex 3D structures with submicron resolution via FP NanoPrinter. (A to B) Metamaterial structures and their enlarged view. (C) Nanowire arrays demonstration a lateral and axial resolution of 90 nm and 141 nm respectively. (D) 3D diffractive optical element (DOE) device.