Fractal cross aperture nano-antenna with graphene coat for bio-sensing application

• In this article, we report a simple application of graphene coat for optical field enhancement.
• We show that graphene coat increased the Q-factor and transmittance of the nano antenna.
• We show that we have various FOM for various graphene chemical potentials.
• With two-difference bias for graphene coat we have two various FOM so we have two factors to design biosensor.

In this paper, we presented a novel shape for nano-aperture for biomedical and spectroscopy application. In addition, when the graphene coat layer is added to structure, we are achieving a reconfigurable particle with more transmittance and the impedance parameters can describe the effect of the graphene layer. The prototype structure is simulated with the FDTD method by the CST microwave studio and for the substrate, the SiN layer with refractive index of 1.98 and thickness of 80 nm is selected. The Palik model is implemented for the gold layer with thickness of 30 nm, and single graphene layer is selected for a coat with 1 nm thickness. The prototype antenna has the dual band characteristic at 46 and 86 THz for biomedical sensing at mid infrared application. The graphene coat is improving the transmittance in the prototype nano-particle. Here we show that the graphene layer implementation is useful for making biosensor with more accuracy and sensitivity. The prototype structure shows orthogonal characteristic that made it useful for solar cell application and energy harvesting in by enhancement of electrical field in both X and Y directions.

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