等离子体模式与热物理性质对用于生物传感的高度有序激光诱导周期性表面结构（LIPSS）双脉冲结构化的影响
Impact of Plasmonic Modes and Thermophysical Properties on the Double-Pulse Structuring of Highly-Ordered LIPSS for Biosensing Applications
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中文总结 AI 辅助
本研究结合实验与理论，利用优化延迟的双脉冲飞秒激光制备高有序LIPSS，揭示等离子体模式与热物理性质对结构的影响，所得结构可用于高灵敏度等离子体生物传感。
中文摘要 AI 辅助
在金属薄膜上制备高度有序的激光诱导周期性表面结构（LIPSS）主要由周期性电磁能量沉积与复杂流体动力学的协同作用决定。本研究采用双脉冲飞秒激光方案，对32纳米厚金（Au）薄膜上超规则LIPSS的形成开展了实验与理论结合的研究。研究表明，对于薄膜而言，两个界面处耦合表面等离激元极化激元（SPPs）的激发决定了初始能量分布；而最终形貌则受流体动力学过程的显著影响。值得注意的是，由于金的电子-声子耦合较弱且薄膜的热限制程度高，单脉冲辐照会引发不受控的流体动力学不稳定性，形成不均匀形貌。因此，本研究证实，采用优化脉冲间延迟（Δτ=1.2纳秒）的双脉冲方案可有效控制熔融时长与黏度，抑制复杂流体运动，促进高度有序阵列的生长。这些结构支持窄表面晶格共振（SLRs），适用于高灵敏度等离子体生物传感。
英文摘要
The fabrication of highly ordered laser-induced periodic surface structures (LIPSS) on thin metallic films is dictated, predomaninatly, by a synergy of periodic electromagnetic energy deposition and complex fluid dynamics. In this work, we present a combined experimental and theoretical study on the formation of ultra-regular LIPSS on 32-nm-thick Au films using a double-pulse femtosecond laser scheme. We demonstrate that for thin films, the excitation of coupled Surface Plasmon Polaritons (SPPs) at both interfaces dictates the initial energy distribution. On the othe hand, the final morphology is greatly influenced by hydrodynamical processes. Interestingly, due to the low electron-phonon coupling of Au and the high thermal confinement of the thin film, single-pulse irradiation leads to uncontrolled hydrodynamic instabilities a non uniform topographies. Thus, we demonstrate that a double-pulse approach with an optimized interpulse delay (Δτ=1.2 ns) effectively controls the melt duration and viscosity, suppressing complex fluid motion and promoting the growth of highly ordered arrays. These structures support narrow surface lattice resonances (SLRs) suitable for high-sensitivity plasmonic biosensing.
