In this paper, a graphene-MoS2 heterostructure biosensor with silver (Ag) substrate based on the ... more In this paper, a graphene-MoS2 heterostructure biosensor with silver (Ag) substrate based on the surface plasmon resonance (SPR) principle is presented. The biosensor is designed to sense at least monolayer single stranded DNA (ssDNA) which has a thickness of 3.2 nm. The design process is performed according to the best minimum light intensity conception with Transfer Matrix Method (TMM). The background substrate formed by Ag film-MoS2-graphene is simulated numerically by increasing the number of graphene. During this process, the thickness of Ag-film is optimized by taking the light intensity into consideration. The results show that the sensitivity of the biosensor can be enhanced with the number of the graphene layers. The shift in resonance angle, i.e sensitivity, improves at the ratio of 13% with 5-layer graphene.
In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity o... more In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity on its outer wall is investigated rigorously by applying the direct Fourier transform and reducing the problem into the solution of a modified Wiener-Hopf equation. The solution for the field terms are determined in terms of an infinite number of unknown coefficients, which satisfy an infinite set of linear algebraic equations. These equations are solved numerically and the effect of area ratio is presented graphically at the end of the analysis. The same problem is also analyzed by applying the mode-matching technique and the results of the two approaches are compared. It is observed numerically that the Wiener-Hopf technique provides a better convergence than the mode-matching technique.
In this paper, a graphene-MoS2 heterostructure biosensor with silver (Ag) substrate based on the ... more In this paper, a graphene-MoS2 heterostructure biosensor with silver (Ag) substrate based on the surface plasmon resonance (SPR) principle is presented. The biosensor is designed to sense at least monolayer single stranded DNA (ssDNA) which has a thickness of 3.2 nm. The design process is performed according to the best minimum light intensity conception with Transfer Matrix Method (TMM). The background substrate formed by Ag film-MoS2-graphene is simulated numerically by increasing the number of graphene. During this process, the thickness of Ag-film is optimized by taking the light intensity into consideration. The results show that the sensitivity of the biosensor can be enhanced with the number of the graphene layers. The shift in resonance angle, i.e sensitivity, improves at the ratio of 13% with 5-layer graphene.
In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity o... more In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity on its outer wall is investigated rigorously by applying the direct Fourier transform and reducing the problem into the solution of a modified Wiener-Hopf equation. The solution for the field terms are determined in terms of an infinite number of unknown coefficients, which satisfy an infinite set of linear algebraic equations. These equations are solved numerically and the effect of area ratio is presented graphically at the end of the analysis. The same problem is also analyzed by applying the mode-matching technique and the results of the two approaches are compared. It is observed numerically that the Wiener-Hopf technique provides a better convergence than the mode-matching technique.
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Papers by SINAN AKSIMSEK