Chemical Identification of Individual Fine Dust Particles with Resonant Plasmonic Enhancement of Nanoslits in the Infrared
Chemical Identification of Individual Fine Dust Particles with Resonant Plasmonic Enhancement of Nanoslits in the Infrared
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DOI：
10.1021/acsphotonics.6b00812
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发表时间：
2017-02
期刊：
影响因子：
7
通讯作者：
J. Vogt;S. Zimmermann;C. Huck;M. Tzschoppe;F. Neubrech;S. Fatikow;A. Pucci
中科院分区：
文献类型：
--
作者：
J. Vogt;S. Zimmermann;C. Huck;M. Tzschoppe;F. Neubrech;S. Fatikow;A. Pucci
我们通过表面增强红外吸收（SEIRA）光谱证明了单等离子体活性纳米狭缝传感微小粉尘颗粒的能力。研究单个球形二氧化硅粒子的声子激发与单纳米缝隙的等离子体激发耦合，我们能够通过其增强的声子信号检测和化学识别直径为240 nm的单个球体。纳米缝隙中的单硅球在等离子体背景下产生法诺型声子信号。与fdtd模拟的共振时沿狭缝的近场分布一致，位于狭缝中间的粒子对声子硅信号的增强最大。我们的研究结果表明，共振等离子体纳米狭缝是精细和超细粉尘粒子SEIRA光谱的有前途的衬底，并为基于SEIRA的粉尘传感装置提供了指导。
We demonstrate the capability of single plasmonically active nanoslits for sensing of small fine dust particles via surface-enhanced infrared absorption (SEIRA) spectroscopy. Investigating phononic excitations of individual spherical silica particles coupled to the plasmonic excitation of single nanoslits, we are able to detect and chemically identify single spheres with diameters of 240 nm by their enhanced phononic signal. The single silica spheres in nanoslits lead to Fano-type phononic signals on the plasmonic background. The enhancement of the phononic silica signal is highest for particles located in the middle of the slit, in accordance with the FDTD-simulated near-field distribution along the slit at resonance. Our results reveal, that resonant plasmonic nanoslits are promising substrates for SEIRA spectroscopy of fine and ultra fine dust particles and guide the way toward SEIRA based dust sensing devices.