Sensors 2016, 16(6), 899; doi:10.3390/s16060899
Conformal Graphene-Decorated Nanofluidic Sensors Based on Surface Plasmons at Infrared Frequencies
Wei Wei 1,2,3,*
, Jinpeng Nong 1,2,3, Linlong Tang 3,4, Guiwen Zhang 2, Jun Yang 3,4 and Wei Luo 2,3
, Jinpeng Nong 1,2,3, Linlong Tang 3,4, Guiwen Zhang 2, Jun Yang 3,4 and Wei Luo 2,31
Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China
2
College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
3
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China
4
Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China
*
Author to whom correspondence should be addressed.
Academic Editors: Fan-Gang Tseng and Tuhin Subhra Santra
Received: 15 March 2016 / Revised: 20 May 2016 / Accepted: 26 May 2016 / Published: 16 June 2016
(This article belongs to the Special Issue Biomicrofluidics)
Abstract
An all-in-one prism-free infrared sensor based on graphene surface plasmons is proposed for nanofluidic analysis. A conformal graphene-decorated nanofluidic sensor is employed to mimic the functions of a prism, sensing plate, and fluidic channel in the tradition setup. Simulation results show that the redshift of the resonant wavelength results in the improvement of sensitivity up to 4525 nm/RIU. To reshape the broadened spectral lines induced by the redshift of the resonant wavelength to be narrower and deeper, a reflection-type configuration is further introduced. By tuning the distance between the graphene and reflective layers, the figure of merit (FOM) of the device can be significantly improved and reaches a maximum value of 37.69 RIU−1, which is 2.6 times that of the former transmission-type configuration. Furthermore, the optimized sensor exhibits superior angle-insensitive property. Such a conformal graphene-decorated nanofluidic sensor offers a novel approach for graphene-based on-chip fluidic biosensing. View Full-TextKeywords:
sensor; surface plasmons; nanofluidic; conformal grapheme; infrared
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Wei, W.; Nong, J.; Tang, L.; Zhang, G.; Yang, J.; Luo, W. Conformal Graphene-Decorated Nanofluidic Sensors Based on Surface Plasmons at Infrared Frequencies. Sensors 2016, 16, 899.
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