大面积表面增强红外吸收的自组织纳米棒阵列
Self-Organized Nanorod Arrays for Large-Area Surface-Enhanced Infrared Absorption
摘要：
利用基于自组织（SO）纳米棒天线的大面积模板（$cm^2$）证明了高灵敏度表面增强红外吸收（SEIRA）光谱的能力。我们设计了高密度的金纳米棒天线阵列，具有偏振敏感的局部等离子体共振，可在宽带近红外和中红外（IR）光谱上调谐，与所谓的“官能团”窗口重叠。我们展示了偏振敏感的SEIRA活性，均匀的宏观区域和稳定的时间，通过利用原型自组装单分子膜的IR活性十八硫醇（ODT）分子。等离子体激元激发和分子伸缩模式之间的强耦合引起SEIRA中的特征Fano共振。阵列中的活动热点的SO工程使我们能够实现信号幅度提高高达5.7%。该图与光刻纳米天线的响应具有竞争力，并且当光学激发点从微观到宏观尺度变化时是稳定的，从而使具有成本效益的纳米传感器设备的高灵敏度SEIRA光谱学成为可能。
英文摘要：
Capabilities of highly sensitive surface-enhanced infrared absorption (SEIRA) spectroscopy are demonstrated by exploiting large-area templates ($cm^2$) based on self-organized (SO) nanorod antennas. We engineered highly dense arrays of gold nanorod antennas featuring polarization-sensitive localized plasmon resonances, tunable over a broadband near- and mid-infrared (IR) spectrum, in overlap with the so-called 'functional group' window. We demonstrate polarization-sensitive SEIRA activity, homogeneous over macroscopic areas and stable in time, by exploiting prototype self-assembled monolayers of IR-active octadecanthiol (ODT) molecules. The strong coupling between the plasmonic excitation and molecular stretching modes gives rise to characteristic Fano resonances in SEIRA. The SO engineering of the active hotspots in the arrays allows us to achieve signal amplitude improved up to 5.7%. This figure is competitive to the response of lithographic nanoantennas and is stable when the optical excitation spot varies from the micro- to macroscale, thus enabling highly sensitive SEIRA spectroscopy with cost-effective nanosensor devices.
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