Molecular Sensing with Tunable Graphene Plasmons

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• 作者：Andrea Marini ; Iv谩n Silveiro ; F. Javier Garc铆a de Abajo
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：2
• 期：7
• 页码：876-882
• 全文大小：531K
• ISSN：2330-4022

文摘

We study the potential of graphene plasmons for spectrometer-free sensing based on surface-enhanced infrared absorption and Raman scattering. The large electrical tunability of these excitations enables an accurate identification of infrared molecular resonances by recording broadband absorption or inelastic scattering, replacing wavelength-resolved light collection by a signal integrated over photon energy as a function of the graphene doping level. The high quality factor of graphene plasmons plays a central role in the proposed detection techniques, which we show to be capable of providing label-free identification of the molecular vibration fingerprints. We find an enhancement of the absorption and inelastic scattering cross sections by 3鈥? orders of magnitude for molecules in close proximity to doped graphene nanodisks under currently feasible conditions. Our results pave the way for the development of novel cost-effective sensors capable of identifying spectral signatures of molecules without using spectrometers and laser sources.