7 December 2017 Au/NiFe/M(Au, <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<MoS</mml:mi< <mml:mn<2</mml:mn< </mml:msub< </mml:mrow< </mml:math< </inline-formula<, graphene) trilayer magnetoplasmonics DNA-hybridized sensors with high record of sensitivity
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Abstract
The demonstration of biosensors based on the surface plasmon effect holds promise for future high-sensitive electrodeless biodetection. The combination of magnetic effects with surface plasmon waves brings additional freedom to improve sensitivity and signal selectivity. Stacking biosensors with two-dimensional (2-D) materials, e.g., graphene (Gr) and MoS 2 , can influence plasmon waves and facilitate surface physiochemical properties as additional versatility aspects. We demonstrate magnetoplasmonic biosensors through the detuning of surface plasmon oscillation modes affected by magnetic effect via the presence of the NiFe (Py) layer and different light absorbers of Gr, MoS 2 , and Au ultrathin layers in three stacks of Au/Py/M( MoS 2 , Gr, Au) trilayers. We found minimum reflection, resonance angle shift, and transverse magneto-optical Kerr effect (TMOKE) responses of all sensors in the presence of the ss-DNA monolayer. Very few changes of 5 × 10 7 in the ss-DNA’s refractive index result in valuable TMOKE response. We found that the presence of three-layer Gr and two-layer MoS 2 on top of the Au/Py bilayer can dramatically increase the sensitivity by nine and four times, respectively, than the conventional Au/Co/Au trilayer. Our results show the highest reported DNA sensitivity based on the coupling of light with 2-D materials in magnetoplasmonic devices.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ehsan Faridi, Maryam Moradi, Narges Ansari, Amir Hossein Baradaran Ghasemi, Amir Afshar, Seyed Majid Mohseni Armaki, "Au/NiFe/M(Au, <inline-formula< <mml:math display="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"< <mml:mrow< <mml:msub< <mml:mi<MoS</mml:mi< <mml:mn<2</mml:mn< </mml:msub< </mml:mrow< </mml:math< </inline-formula<, graphene) trilayer magnetoplasmonics DNA-hybridized sensors with high record of sensitivity," Journal of Biomedical Optics 22(12), 127001 (7 December 2017). https://doi.org/10.1117/1.JBO.22.12.127001 . Submission: Received: 7 August 2017; Accepted: 16 November 2017
Received: 7 August 2017; Accepted: 16 November 2017; Published: 7 December 2017
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