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Sensors 2016, 16(6), 899; doi:10.3390/s16060899

Conformal Graphene-Decorated Nanofluidic Sensors Based on Surface Plasmons at Infrared Frequencies

1,2,3,* , 1,2,3
,
3,4
,
2
,
3,4
and
2,3
1
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)
View Full-Text   |   Download PDF [3272 KB, uploaded 16 June 2016]   |  

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-Text
Keywords: sensor; surface plasmons; nanofluidic; conformal grapheme; infrared sensor; surface plasmons; nanofluidic; conformal grapheme; infrared
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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