Abstract
All-optical logic gates OR, XOR, AND, and NOT based on two-dimensional (2D) plasmonic metal-insulator-metal (MIM) coupled with an elliptical ring resonator (ERR) are presented, simulated, and investigated by using the numerical method of the FEM (finite elements method). The results are compared and validated with the finite difference time domain (FDTD) method. The proposed logic gates are achieved with the same structure using the constructive and destructive optical interferences between a control signal and input signal(s). Their characterization was mainly done for two spectral regions, visible and near-infrared. A high-intensity contrast ratio (CR) between the logic states (“1” and “0”) can be achieved (28 dB) at these spectral regions. We introduce a new parameter, “gap-threshold ratio (GTR),” to characterize the gap between the maximum and minimum of the transmitted signal intensity for all logic gates. The suggested value of transmission threshold between logic “0” and logic “1” states is \(T_{th}=0.2\). A comparison of the two parameters, CR and GTR, with previous works shows that the proposed structure gives very good results for all logic gates configurations. The proposed all-optical logic gates configuration can be a key component in optical processing and telecommunication devices.
Highlights
The use of all-optical devices has been subject to extensive research in recent years due to its potential applications to replace low-speed electronic components
We will design all-optical logic gates based on a MIM waveguides coupled to an elliptical ring resonator (ERR)
We propose the largest number of plasmonic logic gates with the same resonant frequency in the structure and the same plasmonic resonator, i.e., without the need to modify or reconfigure the Elliptical Ring Resonator (ERR) resonator used to analyze and implement the proposed plasmonic logic gates, we confine ourselves to study OR, XOR, AND and NOT optical logic gates
Summary
The use of all-optical devices has been subject to extensive research in recent years due to its potential applications to replace low-speed electronic components. The surface plasmons polaritons (SPPs), electromagnetic waves that travel along a metal-dielectric or metalair interface, are considered as a promising alternative in high-integration optical circuits due to their ability to manipulate light at the sub-wavelength scale overcoming the diffraction limit [12] They offer many opportunities for optical communication without compromising on size, power consumption and manufacturing cost [13, 14]. Compared to most previous resonator systems using MIM waveguide coupled to elliptical resonators have high coupling coefficient and quality factor [30] This structure offers a simple and efficient solution to realize all-optical logic gate, it is suitable for onchip optical computation and can be used in WDM (Wavelength Division Multiplexing) systems. The proposed device opens the way for the design of optical gates on a chip in the field of high-speed optical communication networks
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