Opt Lett. 2022 Dec 15;47(24):6440-6443. doi: 10.1364/OL.478778.
Harvesting light by metallic structures with sharp corners, or the so-called photonic singularities, has exhibit their potential in nanophotonics, sensing, and bio-medical applications. The high-quality light confinement of the light energy mainly relies on the precise preparation of nanoscale photonic singularities. However, the realization of massive photonic singularities still meets the challenges on integration and low-cost mask multiplexing. Here, we show an angle-dependent elevated nanosphere lithography to achieve massive photonic singularities for spatially modulated light harvesting at the near-infrared regime. The photonic geometrical singularity is constructed by the gold crescent array of plasmonic materials. The numerical simulation shows that the light can be localized at the spatially distributed singularities. This phenomenon is verified experimentally through the infrared spectral measurement. Our work provides the possibility to produce integrated light-harvesting devices for numerous optical applications in illumination, display, and enhanced nonlinear excitation.
通过具有尖角的金属结构（所谓的光子奇点）来采集光，在纳米光子学、传感和生物医学应用中已经显示出其潜力。光能量的高质量限制主要依赖于纳米级光子奇点的精确制备。然而，大量光子奇点的实现仍然面临着集成和低成本掩模复用的挑战。在这里，我们展示了一种角度相关的凸起纳米球光刻技术，以实现近红外区域的空间调制光采集的大量光子奇点。光子几何奇点由等离子体材料的金新月形阵列构成。数值模拟表明，光可以被局域在空间分布的奇点处。通过红外光谱测量实验验证了这一现象。我们的工作为在照明、显示和增强非线性激发等众多光学应用中制造集成光采集器件提供了可能性。
