Gap plasmon (GP) resonance in static surface-enhanced Raman spectroscopy (SERS) structures is generally too narrow and not tunable. Here, we present an adaptive gap-tunable SERS device to selectively enhance and modulate different vibrational modes via active flexible Au nanogaps, with adaptive optical control. The tunability of GP resonance is up to ∼1200 cm^–1 by engineering gap width, facilitated by mechanical bending of a polyethylene terephthalate substrate. We confirm that the tuned GP resonance selectively enhances different Raman spectral regions of the molecules. Additionally, we dynamically control the SERS intensity through the wavefront shaping of excitation beams. Furthermore, we demonstrate simulation results, exhibiting the mechanical and optical properties of a one-dimensional flexible nanogap and their advantage in high-speed biomedical sensing. Our work provides a unique approach for observing and controlling the enhanced chemical responses with dynamic tunability.

中文翻译：

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自适应间隙可调表面增强拉曼光谱

静态表面增强拉曼光谱 (SERS) 结构中的间隙等离子体 (GP) 共振通常太窄且不可调谐。在这里，我们提出了一种自适应间隙可调 SERS 装置，通过主动柔性金纳米间隙和自适应光学控制，选择性地增强和调制不同的振动模式。通过设计间隙宽度，通过聚对苯二甲酸乙二醇酯基板的机械弯曲来促进GP 共振的可调性高达~1200 cm ^–1 。我们证实，调谐的 GP 共振选择性地增强了分子的不同拉曼光谱区域。此外，我们通过激发光束的波前整形动态控制 SERS 强度。此外，我们还展示了模拟结果，展示了一维柔性纳米间隙的机械和光学特性及其在高速生物医学传感中的优势。我们的工作提供了一种独特的方法来观察和控制具有动态可调性的增强化学反应。