Pavlov Dmitrii, Zhizhchenko Alexey, Pan Lei, Kuchmizhak Aleksandr A
Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio Str., 690041 Vladivostok, Russia.
Far Eastern Federal University, 690041 Vladivostok, Russia.
Materials (Basel). 2022 Mar 1;15(5):1834. doi: 10.3390/ma15051834.
The optical response of properly excited periodically arranged plasmonic nanostructures is known to demonstrate sharp resonance features associated with high-Q collective modes demanding for various applications in light-matter interaction, filtering and sensing. Meanwhile, practical realization and replication of plasmonic platforms supporting high-Q modes via scalable inexpensive lithography-free approach is still challenging. Here, we justify direct ablation-free irradiation of Si-supported thin Au film by nanojoule-energy femtosecond laser pulses as a single-step and scalable technology for realization of plasmonic metasurfaces supporting collective plasmonic response. Using an adjustable aperture to control and upscale the size of the fabricated nanostructures, nanobumps and nanojets, we demonstrated plasmonic metasurface supporting collective resonances with a moderately high Q-factor (up to 17) and amplitude (up to 45%) within expanded spectral range (1.4-4.5 µm). Vacuum deposition of thin films above the as-fabricated nanostructure arrays was demonstrated to provide fine tuning of the resonance position, also expanding the choice of available materials for realization of plasmonic designs with extended functionality.
已知适当激发的周期性排列的等离子体纳米结构的光学响应会表现出与高Q集体模式相关的尖锐共振特征，这些模式在光与物质相互作用、滤波和传感等各种应用中都有需求。与此同时，通过可扩展的廉价无光刻方法实现支持高Q模式的等离子体平台的实际制造和复制仍然具有挑战性。在这里，我们证明了用纳焦耳能量的飞秒激光脉冲对硅支撑的薄金膜进行直接无烧蚀辐照，是实现支持集体等离子体响应的等离子体超表面的单步且可扩展技术。通过使用可调节孔径来控制和扩大所制造的纳米结构（纳米凸起和纳米射流）的尺寸，我们展示了在扩展光谱范围（1.4 - 4.5微米）内支持具有适度高Q因子（高达17）和幅度（高达45%）的集体共振的等离子体超表面。在制造好的纳米结构阵列上方进行薄膜的真空沉积被证明可以对共振位置进行微调，这也扩展了用于实现具有扩展功能的等离子体设计的可用材料的选择范围。
