Fajri Muhammad L, Kossowski Nicolas, Bouanane Ibtissem, Bedu Frederic, Poungsripong Peeranuch, Juliano-Martins Renato, Majorel Clement, Margeat Olivier, Le Rouzo Judikael, Genevet Patrice, Sciacca Beniamino
Aix-Marseille Univ, CNRS, CINaM, Marseille 13288, France.
Université Côte d'Azur, CNRS, CRHEA, 06560 Valbonne, France.
ACS Nano. 2024 Aug 19;18(38):26088-102. doi: 10.1021/acsnano.4c06022.
The advent of metasurfaces has revolutionized the design of optical instruments, and recent advancements in fabrication techniques are further accelerating their practical applications. However, conventional top-down fabrication of intricate nanostructures proves to be expensive and time-consuming, posing challenges for large-scale production. Here, we propose a cost-effective bottom-up approach to create nanostructure arrays with arbitrarily complex meta-atoms displaying single nanoparticle lateral resolution over submillimeter areas, minimizing the need for advanced and high-cost nanofabrication equipment. By utilizing air/water interface assembly, we transfer nanoparticles onto templated polydimethylsiloxane (PDMS) irrespective of nanopattern density, shape, or size. We demonstrate the robust assembly of nanocubes into meta-atoms with diverse configurations generally unachievable by conventional methods, including U, L, cross, S, T, gammadion, split-ring resonators, and Pancharatnam-Berry metasurfaces with designer optical functionalities. We also show nanocube epitaxy at near ambient temperature to transform the meta-atoms into complex continuous nanostructures that can be swiftly transferred from PDMS to various substrates via contact printing. Our approach potentially offers a large-scale manufacturing alternative to top-down fabrication for metal nanostructuring, unlocking possibilities in the realm of nanophotonics.
超表面的出现彻底改变了光学仪器的设计，并且制造技术的最新进展正在进一步加速其实际应用。然而，事实证明，传统的自上而下制造复杂纳米结构既昂贵又耗时，这给大规模生产带来了挑战。在此，我们提出一种经济高效的自下而上的方法来创建纳米结构阵列，这些阵列具有任意复杂的超原子，在亚毫米区域内显示出单个纳米颗粒的横向分辨率，从而将对先进且昂贵的纳米制造设备的需求降至最低。通过利用空气/水界面组装，我们将纳米颗粒转移到模板化的聚二甲基硅氧烷（PDMS）上，而无需考虑纳米图案的密度、形状或尺寸。我们展示了纳米立方体稳健地组装成具有各种构型的超原子，这些构型通常是传统方法无法实现的，包括U形、L形、十字形、S形、T形、伽马迪奥恩形、裂环谐振器以及具有定制光学功能的潘查拉特纳姆 - 贝里超表面。我们还展示了在接近环境温度下的纳米立方体外延，将超原子转变为复杂的连续纳米结构，这些结构可以通过接触印刷从PDMS快速转移到各种基板上。我们的方法可能为金属纳米结构的自上而下制造提供一种大规模制造替代方案，为纳米光子学领域开启各种可能性。
