DNA implementation for optical waveguide as a switchable transmission line and memristor

In this paper, an optical waveguide has been developed based on the (Deoxyribonucleic acid) DNA core as a multi-slab structure by switching characteristic at 300 THz. We show that how the DNA with various electrical characteristics can be considered as a reconfigurable material which is placed between two optical metal layers. Therefore, we can control the current and voltage density values based on the divergence of the DNA types as an optical switch. Moreover, we can select the Au and Ag for the metal coat. In this research, we demonstrate that the Ag/DNA/Ag and Au/DNA/Ag have better performance in switching qualification than Au/DNA/Au model as a conventional structure. This DNA core waveguide has a switchable feature which cannot be found at any conventional plasmonic waveguide. The FDTD time domain is used for simulating the waveguide and the current density is considered as an ON/OFF switch. We carry out parametric studies for the physical dimensions of the waveguide and illustrate that how we can improve the switching characteristic. Moreover, we have checked the coupling effect between the transmission lines and defined the figure of merit for switching quality. This structure can be considered as an optical memristor and optical "YES" gate which couldn't be obtained by other graphene waveguide while it became feasible based on DNA switching feature.