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access icon free Nano-scale multifunctional logic gate based on graphene/hexagonal boron nitride plasmonic waveguides

© The Institution of Engineering and Technology
Received 03/05/2019, Accepted 28/08/2019, Revised 29/07/2019, Published 06/09/2019

The concept and analysis of a nano-scale multifunctional logic gate based on graphene/hexagonal boron nitride (h-BN) plasmonic waveguides at a wavelength of 7.5 µm are presented. By using graphene as a metamaterial with outstanding electro-optical properties, various logical operations including AND, OR, and XOR are implemented. The proposed multifunctional structure supports surface plasmons (SPs) whose dispersion properties can be controlled by applying an electrical field to graphene. The effects of the incident polarisation and the substrate of graphene on the transmission of SPs are investigated. Simulations by finite difference time domain method show that the extinction ratios for the presented logical operations are higher than 15 dB. Also, the structure has a compact footprint of 1.12 µm2 which is suitable for using in integrated photonic circuits. This provides a path for the development of novel nano-scale practical on-chip applications such as plasmonic memory devices.

Inspec keywords: graphene; optical waveguides; optical logic; nanophotonics; optical storage; surface plasmons; boron compounds; integrated optics; optical metamaterials

Other keywords: OR; metamaterial; C-BN; XOR; electrical field; integrated photonic circuits; surface plasmons; multifunctional structure; graphene/hexagonal boron nitride plasmonic waveguides; wavelength 7.5 mum; nano-scale multifunctional logic gate; dispersion properties; AND; nano-scale practical on-chip applications; electro-optical properties; plasmonic memory devices; logical operations

Subjects: Nanophotonic devices and technology; Optical waveguides; Integrated optics; Optical computers, logic elements, and interconnects; Optical waveguides and couplers; Nanophotonic devices and technology; Integrated optics; Optical logic devices and optical computing techniques

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