Design of All-Optical Subtractors Utilized with Plasmonic Ring Resonators for Optical Computing

Abstract

In this paper, a novel plasmonic all-optical half-subtractor and full-subtractor are designed for optical computing. The structure of plasmonic subtractors consists of a metal–insulator–metal (MIM) waveguide and rectangular ring resonators covered by a graphene layer. Due to the nonlinear optical properties of graphene, the states of the plasmonic resonators can be controlled by the pump intensity of a pump beam focused on the graphene layer. The resonators can work as all-optical switches with an ultra-fast response time to constitute optical logic devices according to the directed logic mechanism. A finite-difference time-domain method is utilized to numerically investigate the transmission of the output signals which represent the results of subtraction operations. Simulation results obtained indicate that the proposed plasmonic devices have the ability to implement half-subtraction and full-subtraction with a small feature size and fast response time, and provide a new concept and method for the design and realization of optical computing devices.

Multi-resonance plasmonic refractive index sensor based on maze-shaped resonators for biological applications

“…Plasmonic metal-insulator-metal (MIM) waveguides are among the most widely used SPRbased nanostructures for realizing integrated optical circuits [5,6] due to their simple design, low transmission loss, and ability to confine light at deep-subwavelengths [4,7,8]. In the preceding years, various configurations of optical devices have been investigated and designed based on SPP waveguides, such as plasmonic filters [9,10], absorbers [11], modulators [12,13], switches [14], converters [15], demultiplexers [16], amplifiers [17], splitters [18], logic gates [19], and sensors [20,21]. Among these devices, plasmonic refractive index (RI) sensors have various applications in biological fields such as cancer cells, blood groups, DNA recognition and chemical fields such as various gases and chemicals detections and measuring physical quantities such as temperature and pressure [22,23].…”