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Sensors 2016, 16(6), 773;

Molecular Spectrum Capture by Tuning the Chemical Potential of Graphene

Wireless Innovation Lab of Yunnan University, School of Information Science and Engineering, Kunming 650091, Yunnan, China
Radio Monitoring Center of Yunnan Province, Kunming 650228, Yunnan, China
Authors to whom correspondence should be addressed.
Academic Editor: Galina Nemova
Received: 2 April 2016 / Revised: 12 May 2016 / Accepted: 18 May 2016 / Published: 27 May 2016
(This article belongs to the Special Issue SPR, WGM & Nano-Sensors: Advantages and Prospects)
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Due to its adjustable electronic properties and effective excitation of surface plasmons in the infrared and terahertz frequency range, research on graphene has attracted a great deal of attention. Here, we demonstrate that plasmon modes in graphene-coated dielectric nanowire (GNW) waveguides can be excited by a monolayer graphene ribbon. What is more the transverse resonant frequency spectrum of the GNW can be flexibly tuned by adjusting the chemical potential of graphene, and amplitude of the resonance peak varies linearly with the imaginary part of the analyte permittivity. As a consequence, the GNW works as a probe for capturing the molecular spectrum. Broadband sensing of toluene, ethanol and sulfurous anhydride thin layers is demonstrated by calculating the changes in spectral intensity of the propagating mode and the results show that the intensity spectra correspond exactly to the infrared spectra of these molecules. This may open an effective avenue to design sensors for detecting nanometric-size molecules in the terahertz and infrared regimes. View Full-Text
Keywords: graphene; surface plasmons; sensors; molecules graphene; surface plasmons; sensors; molecules

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Cheng, Y.; Yang, J.; Lu, Q.; Tang, H.; Huang, M. Molecular Spectrum Capture by Tuning the Chemical Potential of Graphene. Sensors 2016, 16, 773.

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