A novel proposal based on 2D linear resonant cavity photonic crystals for all-optical NOT, XOR and XNOR logic gates

Naoum Rafah,Kouddad Elhachemi

doi:10.1515/joc-2020-0184

Abstract

Abstract In this paper, we are going to propose a novel structure of all-optical NOT, XOR and XNOR logic gates are presented using a two-dimensional photonic crystal (2D-PhC). This structure is optimized by varying the radius of the cavity, to obtain a quality factor Q = 1192, and also has several ports of entry and one port of output. The size of each structure is equal to 85.8 μm2. The contrast ratios for the structures proposed all-optical NOT, XOR and XNOR logic gates between levels “0” and “1” are, respectively, 25.08, 25.03, and 14.47 dB. The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE). Designed logic gates are characterized by low power consumption, compactness and easy integration.

Highlights

In the world of communication, the speed of data transfer and bandwidth are essential parameters of modern telecommunications networks [1]
The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE)
All-optical logic gates based on photonic crystals (PhCs) have attracted worldwide attention due to the low switching power and high speed of data transfer [5]

Summary

Introduction

In the world of communication, the speed of data transfer and bandwidth are essential parameters of modern telecommunications networks [1]. All-optical logic gates based on photonic crystals (PhCs) have attracted worldwide attention due to the low switching power and high speed of data transfer [5]. A lot of effort has been made to design all-optical logic gates [12,13,14,15,16,17,18,19,20,21], while few studies focused on the development of multifunctional structures. In the studies by Rani et al [23, 24], multifunctional PhC structures were designed using a triangular lattice of air holes in a Si substrate, The waveguide interference in the proposed structures has been used to create logic operations.

Methods

Results

Conclusion