Graphene Plasmon Enhanced Vibrational Sensing of Surface-Adsorbed Layers

被引:200
作者
Li, Yilei [1 ,2 ]
Yan, Hugen [1 ]
Farmer, Damon B. [1 ]
Meng, Xiang [3 ,4 ]
Zhu, Wenjuan [1 ]
Osgood, Richard M. [3 ,4 ]
Heinz, Tony F. [2 ]
Avouris, Phaedon [1 ]
机构
[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA
[2] Columbia Univ, Dept Phys, New York, NY 10027 USA
[3] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA
[4] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA
基金
美国国家科学基金会;
关键词
Graphene; plasmons; polymers; vibrations; enhancement; induced transparency; infrared spectroscopy; ELECTROMAGNETICALLY INDUCED TRANSPARENCY; NANOSTRUCTURES; RESONANCE; METAMATERIALS; GAS;
D O I
10.1021/nl404824w
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We characterize the influence of graphene nanoribbon plasmon excitation on the vibrational spectra of surface-absorbed polymers. As the detuning between the graphene plasmon frequency and a vibrational frequency of the polymer decreases, the vibrational peak intensity first increases and is then transformed into a region of narrow optical transparency as the frequencies overlap. Examples of this are provided by the carbonyl vibration in thin films of poly(methyl methacrylate) and polyvinylpyrrolidone. The signal depth of the plasmon-induced transparency is found to be 5 times larger than that of light attenuated by the carbonyl vibration alone. The plasmon-vibrational mode coupling and the resulting fields are analyzed using both a phenomenological model of electromagnetically coupled oscillators and finite-difference time-domain simulations. It is shown that this coupling and the resulting absorption enhancement can be understood in terms of near-field electromagnetic interactions.
引用
收藏
页码:1573 / 1577
页数:5
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