Three-dimensional (3D) plasmonic metamaterials, featuring well-arranged subwavelength nanostructures, facilitate effective coupling between electrical dipoles and incident electromagnetic waves. This coupling allows for unique optical responses including localized surface plasmon resonance (LSPR) and quasi-bound states in the continuum (q-BIC). While 3D plasmonic metamaterials with LSPR and q-BIC have been independently explored for sensors, achieving simultaneous optical responses in the near-infrared region remains challenging. Here, we present 3D plasmonic metamaterials that integrate LSPR and q-BIC within a single π-shaped plasmonic structure, fabricated using a 3D aerosol nanoprinting technique. This printing technique controls the local electrostatic field to precisely position charged metallic nanoaerosols, enabling parallel printing of π-shaped plasmonic structures under ambient conditions. The printed π-shaped plasmonic structures exhibit two distinct optical modes: x-polarization-sensitive LSPR and transverse magnetic mode-sensitive q-BIC within the near-infrared region. Exploiting these dual optical responses, we demonstrate simultaneous polarization detection and incident angle analysis by integrating the π-shaped plasmonic structures into commercial Fourier-transform infrared spectroscopy, termed “numerical aperture-detective polarimetry”. This approach holds promise for evaluating alignment in optical and imaging systems with light distribution analysis. Furthermore, the 3D aerosol nanoprinting technique provides an avenue for fabricating 3D plasmonic metamaterials with intricate geometries and optical properties, expanding their potential applications in nano-optics.

中文翻译：

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通过 3D 气溶胶纳米打印在连续等离子体超材料中使用准束缚态进行角分辨偏振测量


三维（3D）等离子体超材料具有排列整齐的亚波长纳米结构，有助于电偶极子和入射电磁波之间的有效耦合。这种耦合允许独特的光学响应，包括局域表面等离子体共振 (LSPR) 和连续体中的准束缚态 (q-BIC)。虽然具有 LSPR 和 q-BIC 的 3D 等离子体超材料已被独立探索用于传感器，但在近红外区域实现同步光学响应仍然具有挑战性。在这里，我们提出了 3D 等离子体超材料，将 LSPR 和 q-BIC 集成在单个 π 形等离子体结构中，并使用 3D 气溶胶纳米打印技术制造。这种打印技术控制局部静电场以精确定位带电金属纳米气溶胶，从而能够在环境条件下并行打印π形等离子体结构。印刷的π形等离子体结构表现出两种不同的光学模式：近红外区域内的x偏振敏感的LSPR和横向磁模式敏感的q-BIC。利用这些双光学响应，我们通过将 π 形等离子体结构集成到商业傅立叶变换红外光谱中，展示了同步偏振检测和入射角分析，称为“数值孔径检测偏振测定法”。这种方法有望通过光分布分析来评估光学和成像系统的对准。此外，3D气溶胶纳米打印技术为制造具有复杂几何形状和光学特性的3D等离子体超材料提供了途径，扩大了其在纳米光学中的潜在应用。