![]() ![]() Publication Date: Thu Dec 26 00:00: Research Org.: Brookhaven National Lab. Center for Functional Nanomaterials (CFN) of Michigan, Ann Arbor, MI (United States) of Pennsylvania, Philadelphia, PA (United States) ![]() Finally, these 3D optical metamaterials provide prototypes for low-cost, large-scale fabrication of optical metamaterials for ultrathin lenses, polarizers, and waveplates. By tailoring the length, number, and curvature of 3D helical structures in each meta-atom, we create large-area metamaterials with chiroptical responses of as high as ~40% transmission difference between left-hand (LCP) and right-hand (RCP) circularly polarized light (ΔT = T RCP – T LCP) that are suitable for broadband circular polarizers and, upon thermally configuring their shape, switch the polarity of polarization rotation. Here, with a one-step scalable patterning process, we exploit the chemical addressability and structural adaptability of colloidal Au nanocrystal assemblies to transform 2D nanocrystal/Ti bilayers into complex, 3D-structured meta-atoms and to thermally direct their shape morphing and alter their optical properties. Nanofabrication has limited most optical metamaterials to 2D or, often with multiple patterning steps, simple 3D meta-atoms that typically have limited built-in tunability.
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