Conformal Graphene-Decorated Nanofluidic Sensors Based on Surface Plasmons at Infrared Frequencies.
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.
Key Laboratory of Optoelectronic Technology &amp; Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China. wwei@cqu.edu.cn.|College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. wwei@cqu.edu.cn.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. wwei@cqu.edu.cn.
Wei
W
Wei
Key Laboratory of Optoelectronic Technology &amp; Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China. nongjp@cigit.ac.cn.|College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. nongjp@cigit.ac.cn.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. nongjp@cigit.ac.cn.
Jinpeng
J
Nong
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. tll@cigit.ac.cn.|Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China. tll@cigit.ac.cn.
Linlong
L
Tang
College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. 20130813059@cqu.edu.cn.
Guiwen
G
Zhang
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. jyang@cigit.ac.cn.|Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China. jyang@cigit.ac.cn.
Jun
J
Yang
College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. luo@cigit.ac.cn.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. luo@cigit.ac.cn.
Wei
W
Luo
conformal grapheme; infrared; nanofluidic; sensor; surface plasmons