The Analog of JK Flip-Flop Functions Through an Electromagnetic Logic Metastructure Based on Coherent Near-Perfect Absorption

Based on the interference of electromagnetic (EM) waves, an electromagnetic logic metastructure (ELM) with the graphene layers (GLs) is proposed to emulate the functionality of a conventional JK flip-flop. When two coherent EM waves are simultaneously incident on the ELM from opposite directions, a coherent near-perfect absorption (CNPA) peak can be generated within the frequency range of 12~13.8 terahertz (THz), where the phase difference between the coherent waves is denoted as ΔΦ. If the value of the CNPA peak exceeds 0.55, the output level F of the ELM is defined as ‘1’; otherwise, it is defined as ‘0’. With the assistance of the ΔΦ, the chemical potential (μC) of the GLs and the incident angle (θ) are utilized as the input signals corresponding to the J and K inputs of the JK flip-flop, which can effectively simulate JK flip-flop functions: set function, clear function, toggle, and no-change. Therefore, by appropriately configuring the logical parameters ΔΦ, μC, and θ, the proposed ELM can effectively emulate the part functions of a JK flip-flop, offering a promising approach for enhancing the capabilities of EM logic devices.