通过Spinodal分解的自组装、纳米结构、可调谐超材料
Self-Assembled, Nanostructured, Tunable Metamaterials via Spinodal Decomposition
摘要：
通过纳米级相分离的自组装提供了一个优雅的路线，以制造纳米复合材料的物理性能在单组分系统中无法实现。一类重要的纳米复合材料是光学超材料，它表现出奇异的特性，并导致光传播的敏捷控制的机会。这种超材料通常通过昂贵且难以按比例缩放的自上而下工艺制造，需要不同材料的精确集成。反过来，需要替代的，更有效的路线来制造大规模的超材料，用于具有深亚波长分辨率的实际应用。在这里，我们展示了一个自下而上的方法来制造可扩展的纳米结构的超材料通过旋节分解。为了证明这种方法的潜力，我们利用VO 2-TiO 2系统的固有旋节分解，VO 2中的金属-绝缘体转变和薄膜外延，以产生具有连贯界面和低至15 nm的结构单元的自组织纳米结构（在水平和垂直对准的薄片之间可调谐），其中等频表面是从椭圆到双曲线的温度可调谐的。色散产生超材料行为。这些结果为纳米结构超材料和其他纳米复合材料的制备提供了一条有效的途径。
英文摘要：
Self-assembly via nanoscale phase-separation offers an elegant route to fabricate nanocomposites with physical properties unattainable in single-component systems. One important class of nanocomposites are optical metamaterials which exhibit exotic properties and lead to opportunities for agile control of light propagation. Such metamaterials are typically fabricated via expensive and hard-to-scale top-down processes requiring precise integration of dissimilar materials. In turn, there is a need for alternative, more efficient routes to fabricate large-scale metamaterials for practical applications with deep-subwavelength resolution. Here, we demonstrate a bottom-up approach to fabricate scalable nanostructured metamaterials via spinodal decomposition. To demonstrate the potential of such an approach, we leverage the innate spinodal decomposition of the VO2-TiO2 system, the metal-to-insulator transition in VO2, and thin-film epitaxy, to produce self-organized nanostructures with coherent interfaces and a structural unit cell down to 15 nm (tunable between horizontally- and vertically-aligned lamellae) wherein the iso-frequency surface is temperature-tunable from elliptic- to hyperbolic-dispersion producing metamaterial behavior. These results provide an efficient route for the fabrication of nanostructured metamaterials and other nanocomposites for desired functionalities.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
